How is hydrogen unique?

What makes hydrogen so basic and essential to the formation of matter and life—and sets it apart from all other elements in the universe—is its lack of a neutron. This makes hydrogen the simplest and smallest of all atoms, with only one proton at the center and one electron that orbits around it.

Hydrogen is unique in that it can act like a metal in an ionic compound, donating electrons to the non-metal it bonds with or like a non-metal in a molecular compound, sharing electrons with another atom.

ans-D

Explanation:

As given in question

number of atoms in each sample are equal,

Suppose number of atoms in each sample=X;

number of mole = number of molecule(N)/Avogadro number(NA);

Number of mole of Zn=X/NA;

Number of mole of Al=X/NA;

Where NA=avogadro number;

Mass of Zn sample=mole * molecular weight of Zn

Mass of Zn sample=(X/NA)*65

Mass of Al sample=mole * molecular weight of Al

Mass of Al sample=(X/NA)*27;

Thus masses are:

Mass of Zn sample=(X/NA)*65

Mass of Al sample=(X/NA)*27

from above value it is clearly that mass of Zn is more than twice of mass of Al

that is Massof Zn>2*Mass of Al

hence option D is correct