What is the reason for the trend in Electronegativity? Select all that apply. A. number of valence electrons.
B. number of protons in the nucleus
C. number of energy levels around the nucleus D. larger atomic mass number
E. number of neutrons in the nucleus

Can anyone (a-level) a student was analysing a carbonate compound, mco3, containing an unknown group 2 metal, m. the student carried out thermal decomposition on 0.730g of the carbonate and measured the volume of gas produced. mco3 (s) mo (s) + co2 (g) the student collected and measured 120cm3 of carbon dioxide. 1 mol of carbon dioxide occupies 24 000 cm3 under these conditions. calculate the molar mass of the group 2 carbonate and hence deduce the identity of the group 2 metal, m.

Which statement describes james chadwick’s discovery.

How many molecules are in 6.0 moles of methane