15. A divalent element has an atomic number of 20. The number of electrons and protons in its
cationic form are​

Correct relationship between molecular formula and empirical formula

Kp is the equilibrium constant for dissociation of the propionic acid dimer. what is the sign of the slope for a plot of the natural logarithm of kp vs. inverse temperature for this reaction?

What type of chemical bond is formed between two atoms of bromine 1. metallic 2. hydrogen 3. ionic 4. covalent