The atomic numbers of elements P, Q, R, S and T are given below.
Element P Q R S T
Atomic number 7 10 12 4 19
From the above table, answer the following questions.
(a) Which element among these is a non-metal ?
(b) Which element belongs to 3rd period of periodic table ?
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) w is the noble gas having atomic number 10 and configuration (2,8)
(ii) x, y and z are the s block elements. They have 2,2 and 1 electrons in their outermost shell respectively.
(iii) Atomic size decreases across the period and increases down the group. Element z is having more atomic size
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The answers to the following questions are:
(a) The elements P (7) and Q (10) among these are non-metals.
- The element P is Nitrogen and Q is Neon.
- Both of these are non-metals.
- All the other elements (R, S and T) are metals.
(b) The element R (12) belongs to the 3rd period of periodic table.
- The element R is Magnesium.
- It belongs to the 2nd group and 3rd period of the periodic table.
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