2018 Year 9 Chapter 2 Materials

Question 1

What is the makeup of an atom?

Answer 1

Protons and neutrons sit in a cluster in the middle of the atom that makes up the nucleus. Electrons are much smaller and faster and form an electron cloud outside of the nucleus.

Question 2

What is a compound?

Answer 2

A substance made up of different types of atoms

Question 3

What is a negatively charged atom called? Give an example

Answer 3

When an atom gains an electron, it becomes negatively charged and is called an anion. For example, if chlorine gains an electron, it goes from Cl to Cl-

Question 4

What is a positively charged atom called. Give an example.

Answer 4

If an atom loses an electron, it becomes positively charged and is called a cation. For example, if sodium loses an electron, it becomes a cation and goes from Na to Na+

Question 5

What is the mass of an electron compared to the mass of a proton?

Answer 5

Electrons are approximately 1800 times lighter than protons

Question 6

What is half-life?

Answer 6

The time it takes for half the nuclei of an atom to decay

Question 7

What is nuclear radiation used for in medicine?

Answer 7

Radiotherapy

Question 8

What is ph?

Answer 8

The concentration of hydrogen ions (h+) in a solution