Question

write down the periodic table ​

Answer 1

Answer:

learn first 20 elements on the basis of atomic number(henry mosely)

Explanation

1

Hydro­gen

1

H

​1.008

He­lium

2

He

​4.0026

2  

Lith­ium

3

Li

​6.94

Beryl­lium

4

Be

​9.0122

Boron

5

B

​10.81

Carbon

6

C

​12.011

Nitro­gen

7

N

​14.007

Oxy­gen

8

O

​15.999

Fluor­ine

9

F

​18.998

Neon

10

Ne

​20.180

3  

So­dium

11

Na

​22.990

Magne­sium

12

Mg

​24.305

Alumin­ium

13

Al

​26.982

Sili­con

14

Si

​28.085

Phos­phorus

15

P

​30.974

Sulfur

16

S

​32.06

Chlor­ine

17

Cl

​35.45

Argon

18

Ar

​39.95

4  

Potas­sium

19

K

​39.098

Cal­cium

20

Ca

​40.078

Scan­dium

21

Sc

​44.956

Tita­nium

22

Ti

​47.867

Vana­dium

23

V

​50.942

Chrom­ium

24

Cr

​51.996

Manga­nese

25

Mn

​54.938

Iron

26

Fe

​55.845

Cobalt

27

Co

​58.933

Nickel

28

Ni

​58.693

Copper

29

Cu

​63.546

Zinc

30

Zn

​65.38

Gallium

31

Ga

​69.723

Germa­nium

32

Ge

​72.630

Arsenic

33

As

​74.922

Sele­nium

34

Se

​78.971

Bromine

35

Br

​79.904

Kryp­ton

36

Kr

​83.798

5  

Rubid­ium

37

Rb

​85.468

Stront­ium

38

Sr

​87.62

Yttrium

39

Y

​88.906

Zirco­nium

40

Zr

​91.224

Nio­bium

41

Nb

​92.906

Molyb­denum

42

Mo

​95.95

Tech­netium

43

Tc

​[97]

Ruthe­nium

44

Ru

​101.07

Rho­dium

45

Rh

​102.91

Pallad­ium

46

Pd

​106.42

Silver

47

Ag

​107.87

Cad­mium

48

Cd

​112.41

Indium

49

In

​114.82

Tin

50

Sn

​118.71

Anti­mony

51

Sb

​121.76

Tellur­ium

52

Te

​127.60

Iodine

53

I

​126.90

Xenon

54

Xe

​131.29

6  

Cae­sium

55

Cs

​132.91

Ba­rium

56

Ba

​137.33

Lan­thanum

57

La

​138.91

1 asterisk  

Haf­nium

72

Hf

​178.49

Tanta­lum

73

Ta

​180.95

Tung­sten

74

W

​183.84

Rhe­nium

75

Re

​186.21

Os­mium

76

Os

​190.23

Iridium

77

Ir

​192.22

Plat­inum

78

Pt

​195.08

Gold

79

Au

​196.97

Mer­cury

80

Hg

​200.59

Thallium

81

Tl

​204.38

Lead

82

Pb

​207.2

Bis­muth

83

Bi

​208.98

Polo­nium

84

Po

​[209]

Asta­tine

85

At

​[210]

Radon

86

Rn

​[222]

7  

Fran­cium

87

Fr

​[223]

Ra­dium

88

Ra

​[226]

Actin­ium

89

Ac

​[227]

1 asterisk  

Ruther­fordium

104

Rf

​[267]

Dub­nium

105

Db

​[268]

Sea­borgium

106

Sg

​[269]

Bohr­ium

107

Bh

​[270]

Has­sium

108

Hs

​[269]

Meit­nerium

109

Mt

​[278]

Darm­stadtium

110

Ds

​[281]

Roent­genium

111

Rg

​[282]

Coper­nicium

112

Cn

​[285]

Nihon­ium

113

Nh

​[286]

Flerov­ium

114

Fl

​[289]

Moscov­ium

115

Mc

​[290]

Liver­morium

116

Lv

​[293]

Tenness­ine

117

Ts

​[294]

Oga­nesson

118

Og

​[294]

1 asterisk  

Cerium

58

Ce

​140.12

Praseo­dymium

59

Pr

​140.91

Neo­dymium

60

Nd

​144.24

Prome­thium

61

Pm

​[145]

Sama­rium

62

Sm

​150.36

Europ­ium

63

Eu

​151.96

Gadolin­ium

64

Gd

​157.25

Ter­bium

65

Tb

​158.93

Dyspro­sium

66

Dy

​162.50

Hol­mium

67

Ho

​164.93

Erbium

68

Er

​167.26

Thulium

69

Tm

​168.93

Ytter­bium

70

Yb

​173.05

Lute­tium

71

Lu

​174.97

 

1 asterisk  

Thor­ium

90

Th

​232.04

Protac­tinium

91

Pa

​231.04

Ura­nium

92

U

​238.03

Neptu­nium

93

Np

​[237]

Pluto­nium

94

Pu

​[244]

Ameri­cium

95

Am

​[243]

Curium

96

Cm

​[247]

Berkel­ium

97

Bk

​[247]

Califor­nium

98

Cf

​[251]

Einstei­nium

99

Es

​[252]

Fer­mium

100

Fm

​[257]

Mende­levium

101

Md

​[258]

Nobel­ium

102

No

​[259]

Lawren­cium

103

Lr

​[266]

Answer 2

Answer: perodic table is much longer . I have given a image of it go through it

Explanation:

brainly.in is good