An neutral atom has 40 protons and 10 neutrons what is the mass number

What semimetal can form four single covalent bonds.

According to coulomb's law, how would the electrical force between particles change if the product of their electrical charge increased?

For the reaction shown, find the limiting reactant for each of the following initial amounts of reactants. 4al(s)+3o2(g)→2al2o3(s) a) 1 molal, 1 mol o2 b) 4 molal, 2.6 mol o2 c) 16 molal, 13 mol o2 d) 7.4 molal, 6.5 mol o2