The smallest particle of an element that retains its chemical properties is called a:
a) Proton
b) Neutron
c) Electron
d) Atom
Answer: d) Atom
The number of protons in an atom is known as the:
a) Mass number
b) Atomic number
c) Valence number
d) Atomic mass
Answer: b) Atomic number
The atomic mass of an atom is primarily determined by the number of:
a) Electrons
b) Neutrons
c) Protons
d) Nucleons
Answer: d) Nucleons
Which subatomic particle has a positive charge?
a) Proton
b) Neutron
c) Electron
d) Photon
Answer: a) Proton
The atomic number of an element tells us the number of:
a) Protons only
b) Neutrons only
c) Electrons only
d) Protons and neutrons
Answer: a) Protons only
An atom that gains or loses electrons becomes an:
a) Isotope
b) Ion
c) Isomer
d) Compound
Answer: b) Ion
The maximum number of electrons that can occupy the first energy level of an atom is:
a) 2
b) 4
c) 8
d) 16
Answer: a) 2
The energy levels of an atom are also known as:
a) Orbitals
b) Subshells
c) Shells
d) Electrons
Answer: c) Shells
The electron configuration of nitrogen is:
a) 1s² 2s² 2p³
b) 1s² 2s² 2p⁶
c) 1s² 2s² 2p⁴
d) 1s² 2s² 2p⁵
Answer: d) 1s² 2s² 2p⁵
Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹?
a) Magnesium
b) Calcium
c) Aluminum
d) Sodium
Answer: d) Sodium
The elements in the same group of the periodic table have the same number of:
a) Protons
b) Neutrons
c) Electrons
d) Valence electrons
Answer: d) Valence electrons
Elements in the same period of the periodic table have the same number of:
a) Protons
b) Neutrons
c) Electrons
d) Shells
Answer: d) Shells
Which of the following elements is a halogen?
a) Sodium
b) Chlorine
c) Calcium
d) Iron
Answer: b) Chlorine
The element with the symbol Fe belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: b) Transition metals
Which of the following elements is a noble gas?
a) Oxygen
b) Helium
c) Potassium
d) Carbon
Answer: b) Helium
The element with the symbol K belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: a) Alkali metals
Which element has the highest electronegativity value?
a) Sodium
b) Oxygen
c) Fluorine
d) Carbon
Answer: c) Fluorine
The elements in Group 17 of the periodic table are commonly known as:
a) Alkali metals
b) Alkaline earth metals
c) Halogens
d) Noble gases
Answer: c) Halogens
Which of the following elements is a metalloid?
a) Silicon
b) Iron
c) Copper
d) Aluminum
Answer: a) Silicon
The atomic radius generally:
a) Increases across a period and decreases down a group
b) Decreases across a period and increases down a group
c) Increases across a period and remains constant down a group
d) Decreases across a period and remains constant down a group
Answer: b) Decreases across a period and increases down a group
The ionization energy of an atom refers to the energy required to:
a) Remove an electron from the atom
b) Add an electron to the atom
c) Convert the atom to an ion
d) Convert the ion to an atom
Answer: a) Remove an electron from the atom
Which of the following elements has the highest ionization energy?
a) Sodium
b) Potassium
c) Calcium
d) Helium
Answer: d) Helium
The element with the largest atomic radius is found in which group of the periodic table?
a) Group 1 (Alkali metals)
b) Group 14
c) Group 17 (Halogens)
d) Group 18 (Noble gases)
Answer: d) Group 18 (Noble gases)
The elements in Group 1 of the periodic table are commonly known as:
a) Alkali metals
b) Alkaline earth metals
c) Transition metals
d) Halogens
Answer: a) Alkali metals
The element with the symbol Ag belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: b) Transition metals
Which of the following elements is a nonmetal?
a) Sodium
b) Chlorine
c) Iron
d) Calcium
Answer: b) Chlorine
The electron configuration of oxygen is:
a) 1s² 2s² 2p³
b) 1s² 2s² 2p⁶
c) 1s² 2s² 2p⁴
d) 1s² 2s² 2p⁵
Answer: c) 1s² 2s² 2p⁴
The element with the symbol Ne belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: d) Noble gases
Which element has the highest atomic number?
a) Uranium
b) Plutonium
c) Neptunium
d) Americium
Answer: a) Uranium
The element with the symbol Cu belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: b) Transition metals
Which of the following elements is a metal?
a) Fluorine
b) Bromine
c) Carbon
d) Sodium
Answer: d) Sodium
The element with the symbol Hg belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: b) Transition metals
The atomic number of an element is equal to the number of:
a) Electrons only
b) Protons only
c) Neutrons only
d) Protons and neutrons
Answer: b) Protons only
The element with the symbol He belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: d) Noble gases
Which element has the lowest electronegativity value?
a) Oxygen
b) Helium
c) Potassium
d) Carbon
Answer: c) Potassium
The electron configuration of potassium is:
a) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
b) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
c) 1s² 2s² 2p³
d) 1s² 2s² 2p⁴
Answer: b) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
The element with the largest ionization energy is found in which period of the periodic table?
a) Period 1
b) Period 2
c) Period 17
d) Period 18
Answer: d) Period 18
The element with the smallest atomic radius is found in which group of the periodic table?
a) Group 1 (Alkali metals)
b) Group 14
c) Group 17 (Halogens)
d) Group 18 (Noble gases)
Answer: c) Group 17 (Halogens)
Which of the following elements is a transition metal?
a) Sodium
b) Chlorine
c) Iron
d) Carbon
Answer: c) Iron
The element with the symbol Pb belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: b) Transition metals
The electron configuration of calcium is:
a) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰
b) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
c) 1s² 2s² 2p³
d) 1s² 2s² 2p⁴
Answer: b) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
The element with the symbol Br belongs to which group of the periodic table?
a) Alkali metals
b) Transition metals
c) Halogens
d) Noble gases
Answer: c) Halogens
Which of the following elements is a noble gas?
a) Oxygen
b) Helium
c) Potassium
d) Carbon
Answer: b) Helium
The elements in Group 2 of the periodic table are commonly known as:
a) Alkali metals
b) Alkaline earth metals
c) Halogens
d) Noble gases
Answer: b) Alkaline earth metals
Which of the following elements is a metalloid?
a) Silicon
b) Iron
c) Copper
d) Aluminum
Answer: a) Silicon
The atomic radius generally:
a) Increases across a period and decreases down a group
b) Decreases across a period and increases down a group
c) Increases across a period and remains constant down a group
d) Decreases across a period and remains constant down a group
Answer: b) Decreases across a period and increases down a group
The ionization energy of an atom refers to the energy required to:
a) Remove an electron from the atom
b) Add an electron to the atom
c) Convert the atom to an ion
d) Convert the ion to an atom
Answer: a) Remove an electron from the atom
Which of the following elements has the highest ionization energy?
a) Sodium
b) Potassium
c) Calcium
d) Helium
Answer: d) Helium
The element with the largest atomic radius is found in which group of the periodic table?
a) Group 1 (Alkali metals)
b) Group 14
c) Group 17 (Halogens)
d) Group 18 (Noble gases)
Answer: d) Group 18 (Noble gases)
The elements in Group 17 of the periodic table are commonly known as:
a) Alkali metals
b) Alkaline earth metals
c) Halogens
d) Noble gases
Answer: c) Halogens
Which of the following elements is a metalloid?
a) Silicon
b) Iron
c) Copper
d) Aluminum
Answer: a) Silicon
The atomic radius generally:
a) Increases across a period and decreases down a group
b) Decreases across a period and increases down a group
c) Increases across a period and remains constant down a group
d) Decreases across a period and remains constant down a group
Answer: b) Decreases across a period and increases down a group
The ionization energy of an atom refers to the energy required to:
a) Remove an electron from the atom
b) Add an electron to the atom
c) Convert the atom to an ion
d) Convert the ion to an atom
Answer: a) Remove an electron from the atom
