Question

in Science periodic table 1 to 30 elements and their symbols atomic numbers numbers of protons numbers of neutrons numbers of electrons distribution of electrons and valency​

Answer 1

Answer:

periodic table

Explanation:

Element A

1. Atomic number =7= Number of electrons =2,5

Valency of A=8−5=3

Element B

electronic configuration =2,8,8

Valency of B=zero

Element C has 13 electrons

electronic configuration =2,8,3

Valency of C=3

Element D

Protons =18= Electrons =2,8,8

Valency of D=Zero

Element E

electronic configuration =2,8,8,1

Valency of E=1

Answer 2

Explanation:

Atomic

Number Symbol Name Atomic Mass

(amu, g/mol)

1 H Hydrogen 1.00797

2 He Helium 4.00260

3 Li Lithium 6.941

4 Be Beryllium 9.01218

5 B Boron 10.81

6 C Carbon 12.011

7 N Nitrogen 14.0067

8 O Oxygen 15.9994

9 F Fluorine 18.998403

10 Ne Neon 20.179

11 Na Sodium 22.98977

12 Mg Magnesium 24.305

13 Al Aluminum 26.98154

14 Si Silicon 28.0855

15 P Phosphorus 30.97376

16 S Sulfur 32.06

17 Cl Chlorine 35.453

18 Ar Argon 39.948

19 K Potassium 39.0983

20 Ca Calcium 40.08

21 Sc Scandium 44.9559

22 Ti Titanium 47.90

23 V Vanadium 50.9415

24 Cr Chromium 51.996

25 Mn Manganese 54.9380

26 Fe Iron 55.847

27 Co Cobalt 58.9332

28 Ni Nickel 58.70

29 Cu Copper 63.546

30 Zn Zinc 65.38

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