Question

An Element “X” has 13protons, 13electrons 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

Answer 1

( a ) atomic number of X is 13
( b ) X is Aluminium
( c ) its valency is 3 . Its valence electrons is 3
( d ) positive ion because it loses its electron
( e ) electrons were discovered by JJ Thompson and protons by E Rutherford
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Answer 2

(a)13
(b)aluminium
(c)valency=3
valence electron =3
(d)positive ion is formed by the element x bcz it transferred their valence electron.
(e)electron is discovered by j.j thomson and proton is discovered by Goldstein.