Atomic Structure And Isotopes A Level

Question 1

Isotope

Answer 1

Atoms with the same number of protons but a different number of neutrons

Question 2

Relative atomic mass

Answer 2

The weighted average mass of an element relative to the mass of 1/12 a carbon12 atom

Question 3

Relative isotopic mass

Answer 3

The mass of an isotope relative to the mass of 1/12 a carbon 12 atom

Question 4

Relative molecular mass

Answer 4

Relative molecular mass of a molecule is the sum of the relative atomic masses of the constituent atoms in one molecule

Question 5

Relative formula mass

Answer 5

Relative formula mass of a compound is the sun of the relative atomic masses of constituent atoms in one formula unit

Question 6

What is a mass spectrometer used for?

Answer 6

It gives you the percentage abundance of an isotope

Question 7

Number of electrons that fill the first four shells

Answer 7

1st shell —> 2 e
2nd shell —> 8e
3rd shell —> 18e
4th shell —> 32e

Question 8

Orbital

Answer 8

A 3 dimensional space that can hold 2 electrons with opposite spins

Question 9

Rule of orbitals

Answer 9

Orbitals in a sub shell half full before any completely fill

Question 10

Subshell

Answer 10

It’s a set of orbitals which all have the same energy but different orientations