Y9 T2 CHEM- ATOMS

Question 1

protons + neutrons

Answer 1

mass number

Question 2

1st shell

Answer 2

2 electrons

Question 3

2nd shell

Answer 3

8 electrons

Question 4

3rd shell

Answer 4

8 electrons

Question 5

why did mendleev leave gaps in the periodic table

Answer 5

because he put them in order of atomic mass and knew there were some missing

Question 6

what is an isotope

Answer 6

element with the same number of protons but different number of neutrons

Question 7

when an element looses or gains electrons it becomes

Answer 7

an ion

Question 8

if a metal looses electrons it is

Answer 8

positivly charged

Question 9

Equations need to be

Answer 9

balanced

Question 10

non metals are found

Answer 10

on the right of the periodic table

Question 11

4th shell

Answer 11

18 elecrons

Question 12

protons have

Answer 12

a +1 charge and a relative mass of 1

Question 13

neutron has

Answer 13

0 charge and 1 relative mass

Question 14

electrons have

Answer 14

very small relative mass and a -1 charge

Question 15

what would you say to the question describe the cell

Answer 15

There are x number or positivity charged protons in the nucleus of the inner shell. There are x number of neutrons in the nuecleus of the inner shell which are not charged . There are x number of negatively charged electrons in the outer shell.

Question 16

Molecule

Answer 16

Two or more atoms

Question 17

Compound

Answer 17

Two or more different elements

Question 18

Element

Answer 18

1 atom