Question

An Element ‘X’ has atomic number 8 and mass number 16.(i)What is such element called?(ii)Find the number Of Protons,electrons and neutron sin ‘X’.(iii)Find the valency of ‘X’.(iv)Write electro nic distribution of ‘X’ in shells. class 9​

Answer 1

Explanation:

1.element is oxygen

2. no. of neutron = mass no.- atomic number

=16-8 = 8

no. of proton = mass no. - no. of neutron

=16-8 = 8

no. of proton= no. of electron

so, no. of electron= 8

3. valency = +2

4. electronic distribution= 2,6,2

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Answer 2

Answer:

Hi your answer is as follows

Explanation:

i)

such elements are called Chalcogens

ii)

number of protons .= atomic number of the element

therefore no, of protons = 6

no of protons = no of electrons

therefore no of electrons = 8

mass number is the sum of protons and neutrons

therefore,

no. of neutron = 8

iii)

Electronic configuration of X = 2 , 8 , 6

therefore valency = 2

iv)

electronic distribution = 2 , 8 , 6

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