plz give me correct answer. urgent.
the correct answer will be marked as brainlist and get like also. no spam.
Answers
Answer:
Explanation:
(i) atomic number = number of protons.
number of protons = mass number - number of neutrons
= 35-18
= 17
∴ atomic number of B is 17
B is Chlorine (Cl)
(ii) Atomic number tells us what element it is.
atomic number = number of protons.
number of protons = mass number - number of neutrons
=40-22
= 18
∴ Element C is Argon (Ar)
It belongs to group 8A or the noble gases or inert gases group.
(iii) First we need to find what element A, B, and D are.
Element A
atomic number = number of protons.
number of protons = mass number - number of neutrons
=23-12
=11
∴ Element A is Sodium (Na)
Its electronic configuration is 2,8,1
Element B
atomic number = number of protons.
number of protons = mass number - number of neutrons
= 35-18
=17
∴ Element B is Chlorine (Cl)
Its electronic configuration is 2,8,7
Element D
atomic number = number of protons.
number of protons = mass number - number of neutrons
= 16-8
=8
∴ Element D is Oxygen (O)
Its electronic configuration is 2,6
(iv) Element A is sodium (Na)
Element B is Chlorine (Cl)
Na + Cl → NaCl
Sodium and chlorine combine to form sodium chloride (NaCl).
It is a stable compound used in many reactions.
It is more commonly known as table salt.
(v) Element A is sodium (Na)
It belongs to period 3.
It is an alkali metal that belongs to group 1.
Found in the S-block of the periodic table.
Hope it helps you :)