A) Properties of the element are given below: Where would you locate the following elements
in the periodic table.a. A soft metal stored under kerosene oil.b. An element with variable valency(more than one) stored under water.c. An element which is tetra valent in organic chemistry.d. An element which is an inert gas with atomic number 2.B) Why does atomic size decreases from left to right in a period and increases down the group

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Solution

A) (a) Na due to very high reactivity stored in kerosene oil.
(b) White phosphorus is poisonous and can spontaneously ignite when it comes in contact with air. For this reason, white phosphorus must be stored under water.
(c) carbon
(d) helium
B) As moving from left to right in a period the no. of electrons increases in the same shell so due to increase in force of attraction between nucleus and electrons size is decreases and as moving down the group the no. of shells increases so as a result size increases.

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Question 41
Properties of the elements are given below. Where would you locate the following elements in the periodic table?

(a) A soft metal stored under kerosene.

(b) An element with variable (more than one) valency stored under water.

(d) An element which is an inert gas with atomic number 2.

(e) An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “anodizing”.

If an element with atomic number 'Z' is an inert gas. In which group would you place an element with atomic number (Z + 2) in the modern periodic table?

If an element with atomic number 'X' is an inert gas, then in which group would you like to place an element with atomic number (X + 1) in the Modern Periodic Table.

(i) Electropositive nature of the element(s) increases down the group and decreases across the period
(ii) Electronegativity of the element decreases down the group and increases across the period
(iii) Atomic size increases down the group and decreases across a period (left to right)
(iv) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Which is the element with the smallest atomic size

Q. An element with variable (more than one) valency stored under water is:

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