Question

(v)
5 cos? 60° + 4 sec? 30° -tan 45º
sin? 30° + cos? 30°​

Answer 1

Answer:

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus.