Chem review

Atoms of 12C, 13C, and 14C have the same number of what: protons, neutrons or

electrons?

• only neutrons
• neutrons and electrons
• neutrons and protons
• protons and electrons

How many electrons are possible in the second energy level?

• 2
• 8
• 4
• 10

The atomic number of an element always equals what?

• The number of electrons in an atom.
• The mass of an atom in atomic mass units.
• The number of neutrons in an atom.
• The number of protons in an atom.

What is the total number of neutrons in an atom of

14N?

• 7
• 5
• 8
• 6

Isotopes of an element have a different number of protons, neutrons or electrons?

• Different number of electrons.
• Different number of protons.
• Same number of neutrons.
• Different number of neutrons.

What is the atomic number of an element that contains 15 protons and 18 electrons?

• 15
• 18
• 16 protons

• 12

What part of the atom contains most of the mass?

• The nucleus
• The neutron
• The proton
• The electron

How many orbitals are there in the s, p, d, f subshells

• s: 2, p: 4, d: 6, f: 8
• s: 1, p: 2, d: 4, f: 6
• s: 1, p: 3, d: 5, f: 7
• s: 1, p: 3, d: 4, f: 5

Write the shorthand electron configuration of Mg.

• [Ar] 4s²
• [Ne] 3s²
• [Ne] 3p²
• [He] 2s²

What element has this electron configuration: 1s2, 2s2, 2p6, 3s2, 3p6 , 4s2, 3d7

• Copper
• Iron
• Nickel
• Cobalt