90 T h 232 belongs to III group- It emits an -particle- The daughter element belongs toA- I groupB- II groupC- III groupD- IV group

The correct option is C III group_90Th^232→ _88Ra^228+_2He^4 ; III II Note that elements from 89 to 103 are placed in group III. ...

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Group Displacement Law

90 T h 232 be...

Question

$_{90} T h^{232}$ belongs to III group. It emits an $α$ -particle. The daughter element belongs to

I group

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II group

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III group

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IV group

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_{90} T h^{232}

α

I I I B

α

β

I I I

α

The atomic numbers of three elements A, B and C are given below :

Element Atomic number

A 5

B 7

C 10

(i) Which element belongs to group 18? (ii) Which element belongs to group 15?

(iii) Which element belongs to group 13? (iv) To which, period/periods do these elements belong?

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