Question

(a) two shells, both of which are completely filled with electrons?
(b) the electronic configuration 2.8.27
fc) a total of three shells, with four electrons in its valence shell?
(a) a total of two shells, with three electrons in its valence shell?
twice as many electrons in its second shell as in its first shell?
4. (a) What property do all elements in the same column of the Periodic Table as
boron have in common?
(b) What property do all elements in the same column of the Periodic Table as
fluorine have in common?
5. An atom has electronic configuration 2, 8, 7.
(a) What is the atomic number of this element?
(b) To which of the following elements would it be chemically similar?
(Atomic numbers are given in parentheses.)
N(7)
F(9)
P(15)
Ar(18)
Periodic Classification of Elements
91​

Answer 1

Answer:

4a...same no. of outermost electron that is 2....they are electron donars...

b.....same no. of outermost electron that is 7...they are electron acceptor...

5a.....17

b.......Flourine ...becoz there valence electron are similar...

Explanation:

hopevit helps..

I cannot understand what do do with the above given questions....