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Byju's Answer

Standard XII

Chemistry

Schrodinger Equation

If the atomic...

Question

If the atomic number of an element is 17 and it has 18 neutrons in its atom, its valency will be _________.

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Solution

The correct option is A 1
For a neutral atom,
Atomic number = Number of protons = Number of electrons

Electronic configuration for an atom with 17 electrons in it is (2,8,7)

Valence electrons are the electrons present in the outermost shell of an atom.
$∴$ The number of valence electrons = 7

Valency of an atom with more than 4 valence electrons = 8 - Number of valence electrons
$∴$ Valency = 8 - 7 = 1

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Similar questions

Q. If the atomic number of an element is 17 and it has 18 neutrons in its atom, its valency will be _________.

Q. An atom has 17 electrons, 17 protons, 18 neutrons. Therefore which of the following is/are true?
(a) Its atomic number is 17
(b) Its mass number is 35

Q. An element with atomic number

17

is placed in the group

17

of the long from periodic table. Element with atomic number

9

is placed above and with atomic number

35

is placed below it. Element with atomic number

16

is placed left and with atomic number

18

is placed right to it. Which of the following statements are correct?

a) Valency of the element with atomic number

18

is zero.

b) Elements with same valency will have atomic number

16

17

and

18

c) Valency of element with atomic number

9

17

and

35

is one.

d) Element with atomic number

17

is more electronegative than element with atomic number

16

and

35

Multiple Choice Questions

(a) The outermost shell of an atom is known as

(i) valency

(ii) valence electrons

(iii) nucleus

(iv) valence shell

(b) The number of valence electrons present in magnesium is

(i) two

(ii) three

(iii) four

(iv) five

(i) proton

(ii) neutron

(iii) electron

(iv) nucleon

(d) If the atomic number of an atom is 17 and mass number is 35 then number of neutrons will be

(i) 35

(ii) 17

(iii) 18

(iv) 52

(e) The number of electrons in an atom is equal to the number of

(i) protons in a neutral atom

(ii) neutrons in a neutral atom

(iii) nucleons in a neutral atom

(iv) none of the above

(f) The sum of number of protons and number of neutrons present in the nucleus of an atom is called its

(i) mass number

(ii) atomic number

(iii) number of electrons

(iv) all of the above

The atomic number of an element Y is 17. The number of electrons in its ion $Y^{-}$ will be
(a) 17 (b) 18 (c) 19 (d) 20

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