3 - Atomic and Electronic Structure

Question 1

Atomic Number

Answer 1

The number of protons in the nucleus.

Question 2

Mass number

Answer 2

The number of protons plus neutrons in the nucleus.

Question 3

Isotopes

Answer 3

Atoms of the same element with the same atomic number, but different mass numbers.

Question 4

Relative Isotopic Mass

Answer 4

The mass of one atom of an isotope relative to the mass of one atom of carbon-12, for which the relative mass is defined as exactly 12.

Question 5

First Ionization Energy

Answer 5

The energy needed to remove one electron from each atom in one mole of gaseous atoms.

Question 6

Orbital

Answer 6

A region in space around the nucleus of an atom in which there is a 95% chance of finding an electron, or a pair of electron with opposite spins.