Question

subatomic particles worksheet (fill in the missing information) element atomic # atomic mass #p⁺ #e⁻ #n⁰ magnesium 12 12 12 argon 40 18 18 22 helium 2 2 2 boron 5 5 5 6 chlorine 17 17 17 18 silicon 28 14 14 14 fluorine 19 9 9 10 hydrogen 1 1 1 0 oxygen 8 8 8 8 calcium 40 20 20 20 lithium 7 3 3 4 nitrogen 7 14 7 7 7 sodium 23 11 11 12 sulfur 16 16 16 16 beryllium 9 4 4 5 neon 20 10 10 10 carbon 6 12 6 6 6 phosphorus 31 15 15 16 potassium 19 39 19 19 20 aluminum 27 13 13 14 p⁺ = atomic # n⁰ = atomic mass - atomic # #e⁻ = #p⁺

Explanation:

Step1: Recall atomic number rule

The number of protons (\(\#p^{+}\)) is equal to the atomic number.

Step2: Recall electron - proton equality

The number of electrons (\(\#e^{-}\)) is equal to the number of protons for a neutral atom.

Step3: Calculate neutron number

The number of neutrons (\(\#n^{0}\)) is calculated as atomic mass - atomic number.

Answer:

Element	Atomic #	Atomic mass	\(\#p^{+}\)	\(\#e^{-}\)	\(\#n^{0}\)
argon	18	40	18	18	22
helium	2	4	2	2	2
boron	5	11	5	5	6
chlorine	17	35	17	17	18
silicon	14	28	14	14	14
fluorine	9	19	9	9	10
hydrogen	1	1	1	1	0
oxygen	8	16	8	8	8
calcium	20	40	20	20	20
lithium	3	7	3	3	4
nitrogen	7	14	7	7	7
sodium	11	23	11	11	12
sulfur	16	32	16	16	16
beryllium	4	9	4	4	5
neon	10	20	10	10	10
carbon	6	12	6	6	6
phosphorus	15	31	15	15	16
potassium	19	39	19	19	20
aluminum	13	27	13	13	14