Which of the following is a soft metal in the lightest element that is a solid at standard temperature and pressure?
a)lithium
b)silicon
c)silica
d)cobalt

A)lithium

Explanation:

Among the given options , lithium is the one of the soft element known .

Lithium -

It is a very soft element , denoted by the letters  " Li " , the color of this metal is silver .

The position of lithium in the periodic table is in group 1 , period 2 .

the atomic number of Lithium =3 .

It is the lightest metal and at room temperature and pressure .

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