Tag: chemistry

Calcium occurs as carbonate in limestone $(CaCO _{3})$ and as flouride in flourspar $(CaF _{2})$.

Sodium occurs as chloride in rock salt, $(NaCl)$ and calcium occurs as fluoride in flourspar $(CaF _{2})$.

Copper occurs as an oxide ore as cuprite $(Cu _{2}O)$ and as sulphide ore as copper glance $(Cu _{2}S)$.

The element $X$ is calcium with atomic number 20 and electronic configuration (2,8,8,2). It has 2 valence electron.

Metal are defined as those element which posses luster, are malleable and ductile and good conductor of electricity. They are hard and have high density.

In the periodic table there are 22 non metals out of which 10 non metals are solids, one non metal is liquid and remaining 11 non metal are gases.
Nitrogen is one of the 22 non metals.

Metalloid is a chemical element with properties in between or that are a mixture of those of metal and non metal. Boron is also one of the metalloids

Metalloids are elements which have some metals property and some non-metals property. The element $X$ is germanium which is metalloid.

Non-metal is an element that usually has low density, a dull appearance, a low melting point, and a poor conductor of heat and electricity.

Post transition elements exists from $13^{th}$ to $16^{th}$ group number in the periodic table.