2.1.1 Atomic structure and isotopes.

Question 1

Relative atomic mass.

Answer 1

-The weighted mean mass of the atoms of an element compared to 1/12th of the mass of an atom of C-12.

Question 2

Relative molecular mass.

Answer 2

The weighted mean mass of a molecule of a compound compared to 1/12th of the mass of an atom of C-12.

Question 3

Relative formula mass.

Answer 3

-The weighted meaan mass of the formula unit of a compound compared to 1/12th the mass of an atom of C-12.

Question 4

Isotopes.

Answer 4

-Atoms of the same element with a different mass, the same number of protons (and electrons), but a different number of neutrons.

Question 5

Relative isotopic mass.

Answer 5

-The mass of an atom of an isotope compared to 1/12th of the mass of an atom of C-12.

Question 6

Proton

Answer 6

-Positivly charged particles that have a mass of 1 and a charge of 1+, found in the nucleus of an atom.

Question 7

Electron

Answer 7

-Negatively charged particle with a mass of 1/1836 and a charge of 1-, orbits the nucleus of an atom at energy levels.

Question 8

Neutron

Answer 8

-Particles with a charge of 0 and a mass of 1 which is found in the nucleus of an atom.

Question 9

Atomic number

Answer 9

-The number of protons in an atom which also equals the number of electrons.

Question 10

Mass number

Answer 10

-The number of protons and neutrons within an atom.

Question 11

Orbital

Answer 11

-A region around the nucleus that can hold up to two electrons with opposite spins.

Question 12

Shell

Answer 12

-Major energy level or principle quantum number. Made up of subshells.

Question 13

Sub-shell

Answer 13

-Make up shells. Made up of orbitals.