chemistry, (cap sinsitive)

Mister y

100

It has 7 protons and makes up most of Earth's atmosphere 

Nitrogen

counting atoms

100

Solve 2NaBr2

Na2Br4

200

3O2U5K7

O6U15K21

300

8Cl2O

Cl=16 O=8

400

5Al2(SiO3)3

Al=10 Si=10 O=30

500

2(NH4)3N2

N=8 H=24

Atomic number

100

The number of protons in the nucleus of an atom

atomic number

200

the atomic number of Hydrogen 

1

300

the subatomic particle that determines the atomic number 

protons 

400

Changing the atomic number of an atom changes the...

element

500

what element has 78 protrons 

platinum 

Neutrons

100

Oxygen 

8

200

Argon 

28

300

Gold

79

400

Bh

163

500

I

54

atomic mass

100

Oxygen(easier)

15.99999/16.000

200

Helium(easy)

4.003

300

Neon(Normal

20.18

400

Cobalt(hard)

58.93

500

Holmium(Imposible

164.93033