What is the initials for sodium chloride

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Predict the products butane (c4h10) + oxygen —>