In the Modern Periodic Table,which are the metals among the first ten elements?

What is the position of hydrogen in the periodic table?

Write true or false for the statement: Electronic configuration of hydrogen resembles that of alkaline earth metals.

In the Modern Periodic Table,calcium (atomic number $20$) is surrounded by elements with atomic numbers $12$,$19$,$21$ and $38$. Which of these have physical and chemical properties resembling calcium?

An element $X$ belongs to the $3rd$ period and group $13$ of the Modern Periodic Table.
$(a)$ Determine the valence electrons and the valency of $X$.
$(b)$ Determine the molecular formula of the compound formed when $X$ reacts with an element $Y$ (atomic number $= 8$).
$(c)$ Write the name and formula of the compound formed when $X$ combines with chlorine.

Which of the given elements $A$,$B$,$C$,$D$ and $E$ with atomic numbers $2$,$3$,$7$,$10$ and $30$ respectively belong to the same period?