Question

Solve the attached pic!!!​

Answer 1

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(1) Sulphur

Atomic Number = 16

Number of Neutrons = 16

Number of protons = Atomic number

→ Number of protons = 16

In a Neutral element the number of electrons is equal to the atomic number.

→ Number of electrons in Sulphur = 16

Sum of Number of protons and Neutrons is equal to the mass number.

→ 16 + 16 = Mass number

→ Mass number of sulphur = 32

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(2) Argon

Mass number = 40

Number of neutrons = 22.

Sum of Number of protons and Neutrons is equal to the mass number.

→ Number of protons + 22 = 40

→ Number of protons = 40 - 22

→ Number of protons = 18

Number of protons = Atomic number

→ Atomic number = 18

Atomic number = Number of electrons (only when it is neutral)

→ Number of electrons = 18

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(3) Carbon

Mass number = 12

Number of electrons = 6

Atomic number = Number of electrons (only when it is neutral)

→ Atomic number = 6

Atomic number = Number of protons

→ Number of protons = 6

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(4) Aluminium

Atomic number = 13

Atomic number = Number of protons

→ Number of protons = 13

Number of neutrons = 14

Sum of Number of protons and Neutrons is equal to the mass number.

→ Mass number = 13 + 14

→ Mass number = 27

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(5) Silicon

Mass number = 28

Number of electrons = 14

Number of electrons = Atomic number (neutral)

→ Atomic number = 14

Atomic Number = Number of protons

→ Number of protons = 14

Sum of Number of protons and Neutrons is equal to the mass number.

→ 28 = 14 + Number of neutrons

→ Number of neutrons = 14

Answer 2

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(1) Sulphur

Atomic Number = 16

Number of Neutrons = 16

Number of protons = Atomic number

→ Number of protons = 16

In a Neutral element the number of electrons is equal to the atomic number.

→ Number of electrons in Sulphur = 16

Sum of Number of protons and Neutrons is equal to the mass number.

→ 16 + 16 = Mass number

→ Mass number of sulphur = 32

━━━━━━━━━━━━━━━━━━━━━━

(2) Argon

Mass number = 40

Number of neutrons = 22.

Sum of Number of protons and Neutrons is equal to the mass number.

→ Number of protons + 22 = 40

→ Number of protons = 40 - 22

→ Number of protons = 18

Number of protons = Atomic number

→ Atomic number = 18

Atomic number = Number of electrons (only when it is neutral)

→ Number of electrons = 18

━━━━━━━━━━━━━━━━━━━━━━━

(3) Carbon

Mass number = 12

Number of electrons = 6

Atomic number = Number of electrons (only when it is neutral)

→ Atomic number = 6

Atomic number = Number of protons

→ Number of protons = 6

━━━━━━━━━━━━━━━━━━━━━━━

(4) Aluminium

Atomic number = 13

Atomic number = Number of protons

→ Number of protons = 13

Number of neutrons = 14

Sum of Number of protons and Neutrons is equal to the mass number.

→ Mass number = 13 + 14

→ Mass number = 27

━━━━━━━━━━━━━━━━━━━━━━━

(5) Silicon

Mass number = 28

Number of electrons = 14

Number of electrons = Atomic number (neutral)

→ Atomic number = 14

Atomic Number = Number of protons

→ Number of protons = 14

Sum of Number of protons and Neutrons is equal to the mass number.

→ 28 = 14 + Number of neutrons

→ Number of neutrons = 14