Question

consider the following five elements of the modern periodic table (atomic number of each is given in the parenthesis) P (4), Q(9) , R (14), S (19), T (20)
giving reasons answer the following questions.
a) which two elements belong to the same period
b) which two elements belong to the same group.
c) which elements have seven electrons in its outermost shell? write the formula of its halide​

Answer 1

A container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.

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Answer 2

Answer:

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