Question

write down the formula of the compound resulting from a combination of an element x of atomic number 20 with an elementry of atomic number

Answer 1

Answer:

The atomic number of X is 20. So, its electronic configuration is 2, 8, 8, 2. It has two electrons in its outermost shell. Thus, X atom transfers its two valence electrons to two Y atoms (2, 8, 7) and changes into a stable X ion (X

+2

).

X→X+2+2e

−

2,8,8,2 2,8,8

2[:

..

Y

¨

:]+2e

−

→[:

..

Y

¨

:]

−

These ions are now held together by electrostatic forces of attraction :

X

+

+2[:

..

Y

¨

:]

−

→X

+2

2Y

−

or X

+2

+2Y

−

→XY

2

Explanation:

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