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torisob [31]
3 years ago
13

BRAINLIEST IF ANSWER IN NEXT 5 MIN!!!!

Chemistry
2 answers:
marishachu [46]3 years ago
7 0

Answer: Option (B) is the correct answer.

Explanation:

Elements present in group VII are known as halogens. Elements of group VII are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (As).

Since, they are same group elements so all of them have seven valence electrons.

Whereas inert gases are the gases present in group 8. These are helium, neon, argon, krypton, xenon, and radon.

Active metals are the substances that readily react with another substance. Elements of group 1 are known as active metals as they have only one valence electron.

Therefore, we can conclude that out of the following the halogen elements are all from Group VII.

creativ13 [48]3 years ago
4 0
Halogen elements are the Group VII on the periodic table.
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Answer: Option (a) is the correct answer.

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Atomic number is the sum of only total number of protons present in an element. Whereas mass number is the sum of total number of both protons and neutrons present in an element.

For example, given atom has mass number as 15 and its atomic number is 7.

Therefore, number of neutrons present in it will be calculated as follows.

                    Mass number = no. of protons + no. of neutrons

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                    no. of neutrons = 15 - 7

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