Chapter 2 - Atoms, Ions and Compounds

Question 1

What makes up the nucleus?

Answer 1

Protons and neutrons

Question 2

What subatomic particle occupies the region around the nucleus?

Answer 2

Electrons

Question 3

How are electrons arranged?

Answer 3

In shells around the nucleus

Question 4

what is the relative mass of electrons, protons and neutrons?

Answer 4

Electron 1/1836
Proton 1
Neutron 1

Question 5

Why do atoms have no overall charge?

Answer 5

Same number of electrons and protons so the charges cancel out.

Question 6

Define atomic number

Answer 6

The number of protons in the nucleus of an atom.

Question 7

Define isotopes

Answer 7

They are atoms of the same element with different numbers of neutrons and different masses

Question 8

Define ion

Answer 8

A charged atom. Where the number of electrons and the number of protons differ.

Question 9

Chemical notation of mass number and atomic number:

Answer 9

• Mass number; A= protons+neutrons

- Atomic number: Z= nº of protons

Question 10

What are cations?

Answer 10

Positive ions, atoms with fewer electrons than protons

Question 11

What are anions?

Answer 11

Negative ions, atoms with more electrons than protons.

Question 12

What is relative atomic mass?

Answer 12

The weighted mean mass of an atom of an element relative to 1/12 th of the mass of an atom of carbon-12.

Question 13

What is relative isotopic mass?

Answer 13

The mass of an isotope relative to 1/12 th of the mass of an atom of carbon-12.