Question

Electrons and approximate mass number of first 30 elements

Answer 1

CalciumCa
#20
20 protons + electrons
20 neutrons
40.1 is the atomic mass Argon Ar
#18
18 protons + electrons
22 neutrons
39.9 (rounds to 40) is the atomic mass Sulfur S
#16
16 protons + electrons
16 neutrons
32.1 is the atomic mass
#14
14 protons + electrons
14 neutrons
28.1 is the atomic mass Magnesium Mg
#12
12 protons + electrons
12 neutrons
24.3 is the atomic mass Neon Ne
#10
10 protons + electrons
10 neutrons
20.2 is the atomic mass Oxygen O
#8
8 protons + electrons
8 neutrons
15.9 is the atomic mass Carbon C
#6
6 protons + electrons
6 neutrons
12.0 is the atomic mass Beryllium Be
#4
4 protons + electrons
5 neutrons
9.0 is the atomic mass Helium He
#2
2 protons + electrons
2 neutrons
4.0 is the atomic mass Hydrogen H
#1
1 proton + electron
0 neutrons
1.0 is the atomic mass Lithium Li
#3
3 protons + electrons
4 neutrons
6.9 (rounds up to 7) is the atomic mass Boron B
#5
5 protons + electrons
6 neutrons
10.8 (rounds up to 11) is the atomic mass Nitrogen N
#7
7 protons + electrons
7 neutrons
14.0 is the atomic mass Fluorine F
#9
9 protons + electrons
10 neutrons
18.9 (19) is the atomic mass Sodium Na
#11
11 protons + electrons
12 neutrons
22.9 (23) is the atomic mass Aluminum Al
#13
13 protons + electrons
14 neutrons
26.9 (27) is the atomic mass Phosphorus P
#15
15 protons + electrons
16 neutrons
30.9 (40) is the atomic mass Chlorine Cl
#17
17 protons + electrons
18 neutrons
35.4 is the atomic mass Potassium K
#19
19 protons + electrons
20 neutrons
39.0 is the atomic mass