Complete the following table: Particle Atomic Number Mass Number Number of electrons Number of protons Number of neutrons Sodium atom 11 12 Aluminium ion 27 10 Chloride ion 18 18 Phosphorus atom 31 15 Cuprous iron 28 35

Atomic number = No.of electrons = No.of protons. Mass number = No.of protons + No.of neutrons. Using the above two formulae calculated the missing values in the table given in question. Particle Atomic Number Mass Number Number of electrons Number of protons Number of neutrons Sodium atom 11 23 11 11 12 Aluminium ion 13 27 10 13 14 Chloride ion 17 35 18 17 18 Phosphorus atom 15 31 15 15 16 Cuprous iron 29 64 28 29 35

If radius of the nucleus is 3 . 5 × 10 - 15 m , then find the space or volume occupied by the nucleus.

Nucleus is the positively charged dense region at the centre of an atom, which contains nucleons and is spherical in shape. Volume of a sphere of radius ' r ' is given by, V = 4 3 πr 3 . Therefore, the volume occupied by the nucleus is: V = 4 3 × 22 7 × ( 3 . 5 × 10 - 15 ) 3 V = 1 . 79 × 10 - 43 m 3

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-4>Q 133

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Boron nitride is isoelectronic with:

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Important Questions on Structure of Atom

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 1

Complete the following table:

Particle	Atomic Number	Mass Number	Number of electrons	Number of protons	Number of neutrons
Sodium atom	$11$				$12$
Aluminium ion		$27$	$10$
Chloride ion			$18$		$18$
Phosphorus atom		$31$		$15$
Cuprous iron			$28$		$35$

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 2

If radius of the nucleus is

3.5 \times 10^{- 15} m

, then find the space or volume occupied by the nucleus.

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 3

The approximate radius of a

H

-atom is

0.05 nm,

and that of proton is

1.5 \times 10^{- 15} m .

Assuming both the hydrogen atom and the proton to be spherical, calculate fraction of the space in an atom of hydrogen, that is occupied by the nucleus.

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 5

Write the conclusions of observations of Rutherford's experiment.

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Alpha Question Bank for Engineering: Chemistry>Chapter 2 - Structure of Atom>Exercise-1>Q 6

Calculate the energy of