Atom

Everything is made of matter. Matter is composed of tiny particles called....

Atoms are the ​ (a)   part of an element

A element is a ​ (b)   substance made up of only ​ (c)   type of atom

• smallest
• pure
• one

Is this a compound or element?

• Element

• Compound

Different models have shaped our understanding of the atom. ​ (a)   thought the atom was like a ​ (b)   ball and could not be ​ (c)  

• Dalton
• snooker
• divided.

• Ernest Rutherford's experiments showed that atoms had a small, ​ (a)   charged ​ (b)   at the centre.

• positively
• nucleus

• Bohr's Model suggested that ​ (a)   orbit the nucleus in specific energy levels or "shells." It's similar to ​ (b)   in certain orbits around the sun.

• electrons
• planets

Whose model of the atom is this?

• Bohr

• Dalton

• Thomson

• Heinsberg

number of neutrons = mass number - atomic number. Calculate the number of neutrons in Chlorine.

• 17

• 35

• 18

• 52

number of neutrons = mass number - atomic number. Calculate the number of neutrons in Chlorine.

• 17

• 35

• 18

• 52

Protons are ​ (a)   and Neutrons are ​ (b)   Electrons are ​ (c)  

• Positive,
• Neutral.
• Negative