Yes, it has the atomic # of 20 on the Periodic Table of elements.
18. Calcium has atomic number of 20 so the 2+ ion has two less electrons than the neutral elemnt.
The element with this electron configuration is calcium (Ca), which has 20 electrons.
The chemical formula for calcium carbonate is CaCO3, not calcium carbon monoxide. Carbon monoxide is a different compound consisting of one carbon atom and one oxygen atom with the chemical formula CO.
antimony atom
39.948
Nitrogen is a gas.
Mercury is liquid metal, elemnt symbol is Hg!
A trace element.
The answerto that would be Helium.
Tl is element 81 Thallium, a highly toxic poor metal.
Molar mass is a term applied for molecules, not for atoms.
Hydrochloric acid is made out of two elements, hydrogen and chlorine.