Question

calculate no. of protons, ē, neutrons in
Lu?​

Answer 1

Answer:

You can simply subtract the atomic number from the mass number in order to find the number of neutrons. If the atom is neutral, the number of electrons will be equal to the number of protons.

Answer 2

Answer:

(i) Environmental aspects must be carefully looked into before building

huge dams.

(11) Most industries are concentrated around coal mines.

(1) Petroleum is referred to as “black gold”.

(iv) Quarrying can become a major environmental concern.

Distinguish between the followings.

(i) Conventional and non conventional sources of energy

(ii) Biogas and natural gas

(iii) Ferrous and nonferrous minerals

(iv) Metallic and nonmetallic minerals