Atomic Structure

Question 1

Atom

Answer 1

The smallest particle of an element that contains electrons surrounding a nucleus that contains protons and neutrons.

Question 2

Molecule

Answer 2

A group of two or more atoms chemically combined to form an identifiable unit which retains the properties and composition of the substance.

Question 3

Mass of a proton and neutron

Answer 3

1

Question 4

Mass of an electron

Answer 4

1/1840

Question 5

Charge of a proton

Answer 5

1+

Question 6

Charge of an electron

Answer 6

1-

Question 7

Charge of a neutron

Answer 7

0

Question 8

Atomic number

Answer 8

The number of protons in the nucleus of an atom.

Question 9

Mass number

Answer 9

The number of protons and neutrons in the nucleus of an atom.

Question 10

Isotope

Answer 10

Atoms of the same element which have the same number of protons but a different number of neutrons.

Question 11

Relative atomic mass

Answer 11

The average mass of all the isotopes of an element compared to the mass of 1/12th of a carbon-12 atom.

Question 12

Relative Atomic Mass Formula

Answer 12

(mass of isotope 1 × % abundance of isotope 1) + (mass of isotope 2 × % abundance of isotope 2) /
( % abundance of isotope 1 + % abundance of isotope 2)