Choose the word or phrase from the brackets which correctly completes the following statement:

On moving from left to right in a given Period, the number of shells ___________________ (remains the same/increases/decreases).

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Solution

On moving from left to right in a given Period, the number of shells remains the same.

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Choose the word or phrase from the brackets which correctly completes each of the following statements:-

(a) The element below sodium in the same group would be expected to have a ........... (lower/higher) electro-negativity than sodium and the element above chlorine would be expected to have a ............. (lower/higher) ionization potential than chlorine.

(b) On moving from left to right in a given period, the number of shells ...... (remains the same/ increases decreases).

(d) Metals are good ............. (oxidising agent/ reducing agent) because they are electron.......... (acceptors/donors).

Q. The electronegativities (according to Pauling) of the elements in period 3 of the periodic table are as follows. The elements are arranged in alphabetical order:

Al	Cl	Mg	Na	P	S	Si
1.5	3.0	1.2	0.9	2.1	2.5	1.8

(i) Arrange the elements in the order in which they occur in the periodic table from left to right. (The group 1 elements first, followed by the group 2 element and so on, up to group 7.)
(ii) Choose the word or phrase from the brackets which correctly completes each of the following statements:
(a) The element below sodium in the same group would be expected to have a _________ (lower/higher) electronegativity than sodium and the element above chlorine which would be expected to have a ________ (lower/higher) ionization potential than chlorine.
(b) On moving from left to right in a given period, the number of shells _________ (remains the same/increases/decreases).
(c) On moving down a group, the number of valence electrons __________ (remains the same/increases/decreases).

Assertion: The ionisation energy decreases as we go from left to right in a period.

Reason: The nuclear charge increases as we go from left to right in a period but the number of shells remain the same in a period.

On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?

(a) increases (b) decreases

Q. Assertion :Atomic size decreases in a period due to increase of atomic number. Reason: The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, the atomic size of the element decreases from left to right.

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Choose the word or phrase from the brackets which correctly completes the following statement: On moving from left to right in a given Period, the number of shells ___________________ (remains the same/increases/decreases).

On moving from left to right in a given Period, the number of shells remains the same.

Choose the word or phrase from the brackets which correctly completes the following statement:

On moving from left to right in a given Period, the number of shells ___________________ (remains the same/increases/decreases).