Math, asked by rahulteotia, 10 months ago

First 20 elements along with neutrons, mass number, electronic configuration​

Answers

Answered by daavasri2003
1

Answer:

Hydrogen

Atomic Number: 1

Symbol: H

Atomic Mass: 1

Protons: 1

Neutrons: 0

Electrons: 1

Helium

Atomic Number: 2

Symbol: He

Atomic Mass: 4

Protons: 2

Neutrons: 2

Electrons: 2

Lithium

Atomic Number: 3

Symbol: Li

Atomic Mass: 7

Protons: 3

Neutrons: 4

Electrons: 3

Beryllium

Atomic Number: 4

Symbol: Be

Atomic Mass: 9

Protons: 4

Neutrons: 5

Electrons: 4

Boron

Atomic Number: 5

Symbol: B

Atomic Mass: 11

Protons: 5

Neutrons: 6

Electrons: 5

Carbon

Atomic Number: 6

Symbol: C

Atomic Mass: 12

Protons: 6

Neutrons: 6

Electrons: 6

Nitrogen

Atomic Number: 7

Symbol: N

Atomic Mass: 14

Protons: 7

Neutrons:7

Electrons: 7

Oxygen

Atomic Number: 8

Symbol: O

Atomic Mass: 16

Protons: 8

Neutrons: 8

Electrons: 8

Fluorine

Atomic Number: 9

Symbol: F

Atomic Mass: 19

Protons: 9

Neutrons: 10

Electrons: 9

Neon

Atomic Number: 10

Symbol: Ne

Atomic Mass: 20

Protons: 10

Neutrons: 10

Electrons: 10

Sodium

Atomic Number: 11

Symbol: Na

Atomic Mass: 23

Protons: 11

Neutrons: 12

Electrons: 11

Magnesium

Atomic Number: 12

Symbol: Mg

Atomic Mass: 24

Protons: 12

Neutrons: 12

Electrons: 12

Aluminum

Atomic Number: 13

Symbol: Al

Atomic Mass: 27

Protons: 13

Neutrons: 14

Electrons: 13

Silicon

Atomic Number: 14

Symbol: Si

Atomic Mass: 28

Protons: 14

Neutrons: 14

Electrons: 14

Phosphorus

Atomic Number: 15

Symbol: P

Atomic Mass: 31

Protons: 15

Neutrons: 16

Electrons: 15

Sulfur

Atomic Number: 16

Symbol: S

Atomic Mass: 32

Protons: 16

Neutrons: 16

Electrons: 16

Chlorine

Atomic Number: 17

Symbol: Cl

Atomic Mass: 35

Protons: 17

Neutrons: 18

Electrons: 17

Argon

Atomic Number: 18

Symbol: Ar

Atomic Mass: 40

Protons: 18

Neutrons: 22

Electrons: 18

Potassium

Atomic Number: 19

Symbol: K

Atomic Mass: 39

Protons: 19

Neutrons: 20

Electrons: 19

Calcium

Atomic Number: 20

Symbol: Ca

Atomic Mass: 40

Protons: 20

Neutrons: 20

Electrons: 20

Step-by-step explanation:

NB: the superscripts add up to the atomic number of the atom.

Name Atomic Number Electron Configuration            

Period 1

Hydrogen   1                 1s1                                                

Helium          2                 1s2                                              

Period 2

Lithium            3               1s2 2s1                                      

Beryllium          4              1s2 2s2                                

Boron                5               1s2 2s22p1                                  

Carbon          6                1s2 2s22p2                              

Nitrogen          7                 1s2 2s22p3                              

Oxygen         8                 1s2 2s22p4                                

Fluorine               9           1s2 2s22p5                                

Neon             10          1s2 2s22p6                                  

Period 3

Sodium            11            1s2 2s22p63s1                             Magnesium      12           1s2 2s22p63s2                                

Aluminum    13                   1s2 2s22p63s23p1                            

Silicon            14                     1s2 2s22p63s23p2                          

Phosphorus  15                       1s2 2s22p63s23p3                          

Sulfur         16                            1s2 2s22p63s23p4                  

Chlorine         17                            1s2 2s22p63s23p5                  

Argon           18                           1s2 2s22p63s23p6                

Period 4

Potassium 19                          1s2 2s22p63s23p64s1                

Calcium         20                          1s2 2s22p63s23p64s2            

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