# data[].attributes.attachment_link.description
Kerboodle is the digital teaching, learning and assessment service from Oxford University Press.

# data[].attributes.body
Search for Structure and Bonding

# data[].attributes.attachment_link.readable_text
Or sign in with:

Your GCSEPod account and external account must have matching email addresses.

This site uses cookies to enhance your experience. You can accept or reject any non-mandatory cookies using the buttons here:

// if('serviceWorker' in navigator) { // navigator.serviceWorker.register('/service-worker.js'); // }

# data[].attributes.attachment_link.description
Your GCSEPod account and external account must have matching email addresses. This site uses cookies to enhance your experience. You can accept or reject any non-mandatory cookies using the buttons here: // if('serviceWorker' in navigator) { // navigator.serviceWorker.register('/service-worker.js'); // }

# data[].attributes.body
http://www.bbc.co.uk/education/guides/zsp4jxs/revision

# data[].attributes.attachment_link.readable_text
1. 1

2. 2

3. 3

4. 4

5. 5

6. 6

7. 7

8. Page 1of 7

The nuclear model

Atoms contain three sub-atomic particles called protons , neutrons and electrons .

The protons and neutrons are found in the nucleus at the centre of the atom. The nucleus is very much smaller than the atom as a whole. The electrons are arranged in shells around the nucleus.

Properties of sub-atomic particles

Particle

Relative mass

Relative charge

Proton

1

+1

Neutron

1

0

Electron

-1

The number of electrons in an atom is always the same as the number of protons, so atoms are electrically neutral overall.

Atoms can lose or gain electrons. When they do, they form charged particles called ions :

if an atom loses one or more electrons, it becomes a positively charged ion

if an atom gains one or more electrons, it becomes a negatively charged ion

1. 1

2. 2

3. 3

4. 4

5. 5

6. 6

7. 7

8. Page 1of 7

# data[].attributes.attachment_link.title
BBC Bitesize - GCSE Chemistry (Single Science) - Atomic number, mass number and isotopes - Revision 1

# data[].attributes.attachment_link.description
1 2 3 4 5 6 7 Page 1of 7 Atoms contain three sub-atomic particles called protons , neutrons and electrons . The protons and neutrons are found in the nucleus at the centre of the atom. The nucleus is very much smaller than the atom as a whole.