atoms revision

Question 1

what is an element?

Answer 1

atoms of an element that exist on their own

Question 2

what is a compound?

Answer 2

two or more different atoms

Question 3

what is a mixture?

Answer 3

two or more different substances not chemically combined

Question 4

what sub-atomic has no charge

Answer 4

neutron

Question 5

what sub-atomic has a positive charge

Answer 5

proton

Question 6

what sub-atomic has a negative charge

Answer 6

electron

Question 7

what two sub-atomics are in the nucleus

Answer 7

protons and neutrons

Question 8

what is the centre of the atom

Answer 8

nucleus

Question 9

how do you tell if its a compund or element by looking at the letters

Answer 9

each element starts with a capital letter so if theres more than one its a compound

Question 10

what name is given to different versions of atoms that have the same number of protons but different numbers of neutrons?

Answer 10

isotopes

Question 11

how many electrons does it take to fill the first shell

Answer 11

2

Question 12

how many electrons does it take to fill the second shell?

Answer 12

8

Question 13

how many electrons does it take to fill the third shell?

Answer 13

8

Question 14

desribe an isotope

Answer 14

an isotope of an element has the same number of protons but a different number of neutrons

Question 15

what happens if the nucleus of an atom becomes unstable?

Answer 15

it rearranges itself to go to a table state again

Question 16

what is a radioisotope?

Answer 16

a radioactive isotope of an element, an unstable atom that breaks down and releases particles and energy from the nucleus.

Question 17

what can radioisotopes be used for?

Answer 17

tracers or used to kill cancer cells (radiotherapy)

Question 18

what symbol does alpha radiation have?

Answer 18

α

Question 19

what symbol does beta radiation have?

Answer 19

β

Question 20

what symbol does gamma radiation have?

Answer 20

γ

Question 21

what radiation has a positive charge?

Answer 21

alpha

Question 22

what charge does beta have?

Answer 22

negative

Question 23

what charge does gamma radiation have

Answer 23

no charge

Question 24

what can alpha radiation be stopped by?

Answer 24

paper

Question 25

what can aluminium stop?

Answer 25

beta radiation

Question 26

does alpha penetrate low or high power

Answer 26

low

Question 27

does beta penetrate low or high power?

Answer 27

medium

Question 28

does gamma penetrate low or high power

Answer 28

high

Question 29

what are some examples of uses of radiation in everyday life and what is their radiation?

Answer 29

Radiotherapy-y, tracers-b & y, smoke detectors-a, sterilisation of medical equipment and food-y

Question 30

what happens when a proton is added into an atom

Answer 30

atomic number increases

Question 31

what happens when a neutron is added into an atom

Answer 31

changes the atomic mass and element name

Question 32

atomic number, protons and electrons all have…

Answer 32

the same number

Question 33

atomic mass is…

Answer 33

protons and neutrons added together

Question 34

neutrons is the atomic mass - …

Answer 34

protons