Question

fill in the blanks:
1)The symbols A is used to denote the __
a)atomic number b) atomic radius c) atomic mass number d) atomic mass
2) The existence of isotopes is due to the presence of different number of______
a)electrons b) protons c) neutrons d) positrons
3) In the necleus of a sodium atom (23/11Na), there are _____neutrons.
a) 11 b) 12 c) 10 d) 9
4) Isotopes of an element have the same number of_____
a) neutrons b) necleons c) electrons d) atoms
5) The great Indian philosopher____ proposed that matter is made up of invisible tiny particles.
a) Aryabhatta b) Kanad c) Bhaskaracharya d) Chanakya
6) The maximum capacity of the M shell is _____ electrons.
a) 2 b) 8 c) 1550 d) 32
7) The mass of the electrons is ____ times less than that of a hydrogen atom.
a)1800 b) 8100 c) 1550 d) 1600
8) The L shell is the velence shell in ____
a) hydrogen b) chlorine c) oxygen d) sodium
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Answer 1

Answer:

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Answer 2

Answer:

1. The symbols A is used to denote the atomic mass number.
2. The existence of isotopes is due to the presence of different number of neutrons.
3. In the necleus of a sodium atom (23/11Na), there are 12 neutrons.
4. Isotopes of an element have the same number of electrons.
5. The great Indian philosopher Kanad proposed that matter is made up of invisible tiny particles.
6. The maximum capacity of the M shell is 18 electrons.
7. The mass of the electrons is 1800 times less than that of a hydrogen atom.

Sorry mate but I am not sure about the last one.

Thanks!