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Standard IX

Chemistry

Atoms

A nucleus of ...

Question

A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. What will be the atomic number and mass number of new nucleus formed by decay of a $β$ -particle by the radio phosphorus ?

atomic number

= 15

, mass number

= 32

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atomic number

= 16

, mass number

= 32

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atomic number =

16

, mass number

= 33

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atomic number

= 15

, mass number

= 30

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Solution

The correct option is B atomic number $= 16$ , mass number $= 32$
After decay of beta particle one neutron will convert to proton.
So total proton $= 15 + 1 = 16$
Total neutron $= 17 - 1 = 16$
Atomic number $= 16$
Mass number $= 16 + 16 = 32$

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Similar questions

Q. A nucleus of stable phosphorus has

15

protons and

16

neutrons. The nucleus of radio phosphorus has one neutron more than the stable nucleus. What will be its atomic number and mass number ?

Q. A nucleus of stable phosphorus has

15

protons and

16

neutrons. What is its atomic number and mass number ?

Q. Write the atomic number and the symbol of an element which has mass number

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and the number of neutrons

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in the nucleus.

Q. A uranium nucleus (atomic number

92

, mass number

238

) emits an

α - p a r t i c l e

and the resultant nucleus emits

β - p a r t i c l e

. What are the atomic and mass numbers of the final nucleus?
(i) Atomic number

=

_________.
(ii) Mass number

=

_________.

Q. Complete the following table.

(i)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
9	-	10	-	-	-

(ii)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
16	32	-	-	-	Sulphur

(iii)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
16	32	-	-	-	Sulphur

(iv)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
-	2	-	1	-	-

(v)

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
-	1	0	1	1	-

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A nucleus of stable phosphorus has 15 protons and 16 neutrons. What will be the atomic number and mass number of new nucleus formed by decay of a β-particle by the radio phosphorus ?

The correct option is B atomic number =16, mass number=32After decay of beta particle one neutron will convert to proton.So total proton =15+1=16Total neutron =17−1=16Atomic number =16Mass number =16+16=32

A nucleus of stable phosphorus has $15$ protons and $16$ neutrons. What will be the atomic number and mass number of new nucleus formed by decay of a $β$ -particle by the radio phosphorus ?

The correct option is B atomic number $= 16$ , mass number $= 32$
After decay of beta particle one neutron will convert to proton.
So total proton $= 15 + 1 = 16$
Total neutron $= 17 - 1 = 16$
Atomic number $= 16$
Mass number $= 16 + 16 = 32$