Question

An Element “X” has 13 protons, 13 electrons and 14 neutrons.

Answer the following questions:

a) What is its atomic number of „X‟?

b) Identify the element.

c) What is its valency? What is the number of valence electrons is

“x”?

d) What is the type of ion formed by “X” ? Why?

e) Name the scientists who discovered electrons and protons.

Or

(a) Describe Bohr‟s model of an atom.

(b) Draw a sketch of Bohr‟s model of an atom with 3 shells.

(c) What was the drawback of Rutherford‟s model of an atom​

Answer 1

Answer:

1. a)13

b) Aluminum

c)3

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Answer 2

Answer:

a)The atomic number of "X" is 13.

b)The element is Aluminium having atomic number 13.

c)The valency of Aluminium is 3.T he valence electrons is 3.

d)The ion is electropositive trivalent radicals or ions.

e)Electron is discovered by JJThomson and Proton is discovered by Goldstein.

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