Element cards of first 20 elements - Online Science Notes

ELEMENT : HYDROGEN

SYMBOL: H

ATOMIC NUMBER: 1

ATOMIC MASS: 1 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	1	–	–	–

SUBSHELL ELECTRONIC CONFIGURATION: 1s²

VALENCY: 1

GROUP: IA(1) PERIOD:1^ST

BLOCK: s

ELEMENT : HELIUM

SYMBOL: He

ATOMIC NUMBER: 2

ATOMIC MASS: 2 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	–	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²

VALENCY: 0 (Duplet State)

GROUP: VIIIA(0)or 18 PERIOD:1^ST

BLOCK: p

ELEMENT : LITHIUM

SYMBOL: Li

ATOMIC NUMBER: 3

ATOMIC MASS: 7 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	1	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s¹

VALENCY: 1

GROUP: IA or 1 PERIOD:1^ST

BLOCK: s

ELEMENT : BERYLLIUM

SYMBOL: Be

ATOMIC NUMBER: 4

ATOMIC MASS: 9 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	2	–	–

1s²,2s²

VALENCY: 2

GROUP: IIA or 2 PERIOD:2^nd

BLOCK: s

ELEMENT : BORON

SYMBOL: B

ATOMIC NUMBER: 5

ATOMIC MASS: 11 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	3	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p¹

VALENCY: 3

GROUP: IIIA or 13 PERIOD:2^nd

BLOCK: p

ELEMENT : CARBON

SYMBOL: C

ATOMIC NUMBER: 6

ATOMIC MASS: 12 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	4	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p²

VALENCY: 4

GROUP: IVA or 14 PERIOD:2^nd

BLOCK: p

ELEMENT : NITROGEN

SYMBOL: N

ATOMIC NUMBER: 7

ATOMIC MASS: 14 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	5	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p³

VALENCY: 3 or 5

GROUP: VA or 15 PERIOD:2^nd

BLOCK: p

ELEMENT : OXYGEN

SYMBOL: O

ATOMIC NUMBER: 8

ATOMIC MASS: 16 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	6	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁴

VALENCY: 2

GROUP: VIA or 16 PERIOD:2^nd

BLOCK: p

ELEMENT : FLUORINE

SYMBOL: F

ATOMIC NUMBER: 9

ATOMIC MASS: 19 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	7	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁵

VALENCY: 1

GROUP: VIIA or 1 PERIOD:2^nd

BLOCK: p

ELEMENT : NEON

SYMBOL: Ne

ATOMIC NUMBER: 10

ATOMIC MASS: 20 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	–	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶

VALENCY: 0 (OCTET STATE)

GROUP: VIIIA(0) or 18 PERIOD:2^nd

BLOCK: p

ELEMENT : SODIUM

SYMBOL: Na

ATOMIC NUMBER: 11

ATOMIC MASS: 23 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	1	–

1s²,2s²2p⁶, 3s¹

VALENCY: 1

GROUP: IA(1) PERIOD:3^rd

BLOCK: s

ELEMENT : MAGNESIUM

SYMBOL: Mg

ATOMIC NUMBER: 12

ATOMIC MASS: 24 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	2	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²

VALENCY: 2

GROUP: IIA(2) PERIOD:3^rd

BLOCK: s

ELEMENT : ALUMINIUM

SYMBOL: Al

ATOMIC NUMBER: 13

ATOMIC MASS: 27 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	3	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p¹

VALENCY: 3

GROUP: IIIA(13) PERIOD:3^rd

BLOCK: p

ELEMENT : SILICON

SYMBOL: Si

ATOMIC NUMBER: 14

ATOMIC MASS: 28 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	4	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p²

VALENCY: 4

GROUP: IVA(14) PERIOD:3^rd

BLOCK: p

ELEMENT : PHOSPHORUS

SYMBOL: P

ATOMIC NUMBER: 15

ATOMIC MASS: 30 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	5	–

UBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p³

VALENCY: 3 or 5

GROUP: VA(15) PERIOD:3^rd

BLOCK: p

ELEMENT : SULPHUR

SYMBOL: S

ATOMIC NUMBER: 16

ATOMIC MASS: 32 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	6	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p⁴

VALENCY: 2

GROUP: VIA(16) PERIOD:3^rd

BLOCK: p

ELEMENT : CHLORINE

SYMBOL: Cl

ATOMIC NUMBER: 17

ATOMIC MASS: 34 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	7	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p⁵

VALENCY: 1

GROUP: VIIA(17) PERIOD:3^rd

BLOCK: p

ELEMENT : ARGON

SYMBOL: Ar

ATOMIC NUMBER: 18

ATOMIC MASS: 36 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	8	–

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p⁶

VALENCY: 0 (OCTET STATE)

GROUP: VIIIA(0 or 18) PERIOD:3^rd

BLOCK: p

ELEMENT : POTASSIUM

SYMBOL: K

ATOMIC NUMBER: 19

ATOMIC MASS: 39 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	8	1

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p⁶,4s¹

VALENCY: 1

GROUP: IA or 1 PERIOD:4^th

BLOCK: s

ELEMENT : CALCIUM

SYMBOL: Ca

ATOMIC NUMBER: 20

ATOMIC MASS: 40 amu

ELECTRONIC CONFIGURATION:

SHELL	K	L	M	N
NO. OF ELECTRONS	2	8	8	2

SUBSHELL ELECTRONIC CONFIGURATION:

1s²,2s²2p⁶, 3s²3p⁶,4s²

VALENCY: 2

GROUP: IIA or 2 PERIOD:4^th

BLOCK: s

Compiled by:

Sulaksha Purna Shrestha

GEMS, Dhapakhel

References:

www.alamy.com (for atomic structures)

www.shutterstock.com (for atomic structures)

www.depositphotos.com (for atomic structures)