The ratio between the number of neutrons in $C$ (atomic mass $12$) and $Si$ (atomic mass $28$) is

The spectrum of Helium is expected to be similar to that of . . . . . .

The element $Uuq$ (Ununquadium,atomic number $Z = 114$) contains $12.8 \%$ more neutrons compared to protons. What is the approximate mass number of it?

$_{18}Ar^{40}$,$_{20}Ca^{40}$ and $_{19}K^{40}$ are

The number of protons,electrons and neutrons in a species are equal to $17$,$18$ and $18$ respectively. Which of the following will be the proper symbol of this species?

An isotone of $_{32}Ge^{76}$ is:
$(i) \, _{32}Ge^{77}$
$(ii) \, _{33}As^{77}$
$(iii) \, _{34}Se^{77}$
$(iv) \, _{34}Se^{78}$