SCIENCE YR 9 T4 chemical world

Question 1

what is an atomic number

Answer 1

number of protons and electrons of an atom

Question 2

what is a mass number

Answer 2

number of neutron and protons in an atom

Question 3

what is an element

Answer 3

a substance made from 1 atom

Question 4

what is an atom

Answer 4

a collection of proton, neutrons and electrons that makes up matter

Question 5

molecule?

Answer 5

2 or more atoms bonded together

Question 6

compound?

Answer 6

2 or more different types of atom bonded together

Question 7

isotope?

Answer 7

atoms of the same element have different numbers of neutrons

Question 8

atomic mass?

Answer 8

number of protons in an atom

Question 9

nucleus

Answer 9

The nucleus is the dense central core of an atom, composed of protons and neutrons, and containing most of the atom’s mass.

Question 10

valent shell

Answer 10

the outermost shell or orbital of an atom

Question 11

charge of protons, neutrons and electrons

Answer 11

protons - positive (+)
electrons - negative (-)
neutrons - no charge (0)

Question 12

how to find the number of neutrons

Answer 12

Numberofneutrons=Atomicmass−Atomicnumber

Question 13

list 3 types of radiation that can be from during radiation decay

Answer 13

beta decay (β), gamma decay (γ) and alpha decay (α)

Question 14

beta decay?

Answer 14

doesn’t fragment the entire nucleus and instead fragments a neutron, turning into a proton or electron

Question 15

alpha decay

Answer 15

nucleus is ejected from the nucleus of the element. Forming a different atom and a high speed nucleus

Question 16

gamma decay

Answer 16

Gamma decay occurs when the nuclei of the atom split. As it does high speed neutrons are ejected. The neutron impacts other atoms causing them to decay, resulting a chain reaction. Whilst the nuclei split its also give off gamma rays, electromagnetic radiation

Question 17

uses of gamma decay

Question 18

what is half life?

Question 19

what does half life measure?

Question 20

when is nuclear radiation formed?

Question 21

what is an unstable isotope