The p-Block Elements: Overview, Questions, Preparation

The p-Block Elements

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Yamini  Saini

Yamini SainiAssistant Manager - Content

Updated on Apr 22, 2021 02:52 IST
Table of Contents
  1. What is a Periodic Table?
  2. How many elements are there in the Periodic Table?
  3. FAQs on Periodic Table Elements

What is a Periodic Table?

The periodic table is the classification of elements as per their atomic number and chemical properties. All the elements here are arranged in a tabular form, with rows and columns.

How many elements are there in the Periodic Table?

The periodic table has 118 elements. Of these, 94 are naturally occurring, while the rest are synthesised in the laboratories.

Below is the table of periodic elements with their atomic number and mass.

Atomic Number

Atomic Mass

Chemical Element Name

Symbol

1

1.0079

Hydrogen

H

2

4.0026

Helium

He

3

6.941

Lithium

Li

4

9.0122

Beryllium

Be

5

10.811

Boron

B

6

12.0107

Carbon

C

7

14.0067

Nitrogen

N

8

15.9994

Oxygen

O

9

18.9984

Fluorine

F

10

20.1797

Neon

Ne

11

22.9897

Sodium

Na

12

24.305

Magnesium

Mg

13

26.9815

Aluminum

Al

14

28.0855

Silicon

Si

15

30.9738

Phosphorus

P

16

32.065

Sulfur

S

17

35.453

Chlorine

Cl

18

39.948

Argon

Ar

19

39.0983

Potassium

K

20

40.078

Calcium

Ca

21

44.9559

Scandium

Sc

22

47.867

Titanium

Ti

23

50.9415

Vanadium

V

24

51.9961

Chromium

Cr

25

54.938

Manganese

Mn

26

55.845

Iron

Fe

27

58.9332

Cobalt

Co

28

58.6934

Nickel

Ni

29

63.546

Copper

Cu

30

65.39

Zinc

Zn

31

69.723

Gallium

Ga

32

72.64

Germanium

Ge

33

74.9216

Arsenic

As

34

78.96

Selenium

Se

35

79.904

Bromine

Br

36

83.8

Krypton

Kr

37

85.4678

Rubidium

Rb

38

87.62

Strontium

Sr

39

88.9059

Yttrium

Y

40

91.224

Zirconium

Zr

41

92.9064

Niobium

Nb

42

95.94

Molybdenum

Mo

43

98

Technetium

Tc

44

101.07

Ruthenium

Ru

45

102.9055

Rhodium

Rh

46

106.42

Palladium

Pd

47

107.8682

Silver

Ag

48

112.411

Cadmium

Cd

49

114.818

Indium

In

50

118.71

Tin

Sn

51

121.76

Antimony

Sb

52

127.6

Tellurium

Te

53

126.9045

Iodine

I

54

131.293

Xenon

Xe

55

132.9055

Cesium

Cs

56

137.327

Barium

Ba

57

138.9055

Lanthanum

La

58

140.116

Cerium

Ce

59

140.9077

Praseodymium

Pr

60

144.24

Neodymium

Nd

61

145

Promethium

Pm

62

150.36

Samarium

Sm

63

151.964

Europium

Eu

64

157.25

Gadolinium

Gd

65

158.9253

Terbium

Tb

66

162.5

Dysprosium

Dy

67

164.9303

Holmium

Ho

68

167.259

Erbium

Er

69

168.9342

Thulium

Tm

70

173.04

Ytterbium

Yb

71

174.967

Lutetium

Lu

72

178.49

Hafnium

Hf

73

180.9479

Tantalum

Ta

74

183.84

Tungsten

W

75

186.207

Rhenium

Re

76

190.23

Osmium

Os

77

196.9665

Iridium

Ir

78

192.217

Platinum

Pt

79

195.078

Gold

Au

80

200.59

Mercury

Hg

81

204.3833

Thallium

Tl

82

207.2

Lead

Pb

83

208.9804

Bismuth

Bi

84

209

Polonium

Po

85

210

Astatine

At

86

222

Radon

Rn

87

223

Francium

Fr

88

226

Radium

Ra

89

227

Actinium

Ac

90

232.0381

Thorium

Th

91

231.0359

Protactinium

Pa

92

238.0289

Uranium

U

93

237

Neptunium

Np

94

244

Plutonium

Pu

95

243

Americium

Am

96

247

Curium

Cm

97

247

Berkelium

Bk

98

251

Californium

Cf

99

252

Einsteinium

Es

100

257

Fermium

Fm

101

258

Mendelevium

Md

102

259

Nobelium

No

103

262

Lawrencium

Lr

104

261

Rutherfordium

Rf

105

262

Dubnium

Db

106

266

Seaborgium

Sg

107

264

Bohrium

Bh

108

277

Hassium

Hs

109

268

Meitnerium

Mt

110

261.9

Darmstadtium

Ds

111

271.8

Roentgenium

Rg

112

285

Copernicium

Cn

113

286

Ununtrium

Uut

114

289

Flerovium

Fl

115

288

Ununpentium

Uup

116

293

Livermorium

Lv

117

260.9

Ununseptium

Uus

118

294

Oganesson

Og

FAQs on Periodic Table Elements

Q1. Who developed the Periodic Table?

A.  Russian chemist Dimitri Mendeleev is credited with developing the periodic table. He arranged the elements by their properties. In this process, he could predict some undiscovered elements and left gaps for these. In the next 15 years, scientists discovered three elements from his predictions with similar traits.  

Q2. What is oganesson?

A. Oganesson (Og) is a synthetic chemical element at the 118th place of the periodic table. It is also known by its temporary name Ununoctium.

Q3. Which elements were discovered later as predicted by Dimitri Mendeleev?

A. Gallium, Germanium and Scandium were the elements discovered later.

Q4. Which are the noble gases and why are they placed separately?

A. Group 18 depicts noble gases. These are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og). These are kept in a separate group due to their inert nature.

Q5. What were the properties of elements used by Dimitri Mendeleev to develop the periodic table?

A. Atomic mass, the formula of oxide and hydride formed was the basis of the periodic table by Mendeleev.

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