2nd group is also called ………
a) alkali metals
b) alkaline earth metals
c) noble gases
d) halogens
Explanation:The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.
Alkaline earth metals contain ………valence electrons.
a) 3
b)2
c) 4
d) 5
Group III is also called …….
a) alkali metals
b) boron family
c) nitrogen family
d) carbon family
Explanation:The boron group are the chemical elements in group 13 of the periodic table, comprising boron, aluminium, gallium, indium, thallium, and perhaps also the chemically uncharacterized nihonium. The elements in the boron group are characterized by having three valence electrons.
Boron family contains ………. electrons in their valance shell.
a) 3
b) 4
c) 5
d)7
Group IV is also known as ………..
a) Boron family
b) nitrogen family
c) carbon family
d) oxygen family
Explanation:The carbon group is a periodic table group consisting of carbon, silicon, germanium, tin, lead, and flerovium. It lies within the p-block. In modern IUPAC notation, it is called group 14. In the field of semiconductor physics, it is still universally called group IV.
Carbon family contains ………. electrons in their valance shell.
a) 3
b) 4
c) 5
d)7
