Question

Two elements x 17 and y 20
1) which period x and y b
2) which group x and y belong
3)find the no of electron x and y
4)whose atomic size is greater
5) write metals and non metal

Answer 1

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Two elements X and Y have atomic numbers 17 and 20 respectively

1) Which Period do X and Y belong to?

2) Group of X and Y

3) Find the number of electrons in X and Y

4)Whose atomic size is greater

5) Write the metal and non metal

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Given Info,

X and Y have an atomic number 17 and 20 respectively

Period

• 17 exists in the second period and 20 in the third period

X : Second Period

X : Second PeriodY : Third Period

Group

• Element 17 is a Halogen(17)

• Element 20 is an Alkaline Earth Metal (2)

X : Group 2

X : Group 2Y : Group 17

No.of Electrons

Number of electrons in an atom would be equal to the Atomic Number of the corresponding element

• X : 17 electrons (2 in the K shell,8 in the L shell and 7 in M shell)

• Y : 20 electrons ( 2 in K,8 in L,8 in M and 2 in N shell)

Atomic Size

• Atomic size of Y > Atomic Size of X

Nature of the Element

• Element X is a Non Metal

• Element Y is a Metal

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