Fluorine atom contains seven electrons in outermost shell, but its valency is ‘1’. Predict the reason.

According to the electrolysis experiments conducted by ……, the atoms were acquiring negative charge during the process of electrolysis.

Mass of electron is … times less than that of proton.

Neutrons were discovered by …

The atoms of same element which have same numbers of protons, but have different number of neutrons are called ……

Rutherford : …… :: JJ Thomson : Watermelon

Which of the sub-atomic particle is not in the hydrogen?

${}_6^{14}C{,}_6^{13}C{,}_6^{12}C^\{14\}\_6C,^\{13\}\_6C,^\{12\}\_6C$ what are these ?

In ${}_6^{14}C,^\{14\}\_6C,$ how many neutrons are there ?

Rutherford is appreciable, because he found that

Which isotope is very useful to treat goitre ?

Which of the following isotope uses for treatment of Cancer ?

Isotopes are not used in this system.

Carbon dating is related to

Neutrons in ${}_8^{16}O^\{16\}\_8O$ are