Question

the atomic num os element is 17 ​

Answer 1

The atomic no of chlorine is 17. According to the periodic a element can have 2 in L shell 8 in K 8 in M so in case of chlorine it contains 2 in L 8 in K and 7 in M. According to these it is proved that chlorine is the os element in the question or in other words in simple language chlorine is the element needed in the question asked by you.

Answer 2

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17 Atomic Number is of Chlorine atom

# More to learn

• Chlorine is Halogen. (Group - 17 element).

• It has its electronic configuration as : 2,8,7.

• It's mass is 35.5 u.

• It is a gas and non - metal

• It forms many usefull compounds such as NaCl, etc.

• It is 2nd most electronic negative element in periodic table.

• It belongs to Group - 17 and Period - 3.

• It's valency and oxidation number are -1