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1)Always write out the reaction first;

2NaCl+CaCo3-->Na2Co3+CaCl2  

2)Now underneath calculate the Relative Formula Mass using a periodic table for each of the compounds....

Reactivity increases down the group. The number of electron shells increases down the group. Therefore the outer electron is further away from the nucleus. Consequently, the attraction between the outer e...

Copper ions are positively charged. So they are attracted to the negative electrode. The negative electrode is called cathode.At the cathode, each copper ion gains two electrons. They are said to be reduc...

Atoms of the same element possessing the same numbers of protons and electrons, but different numbers of neutrons in the nucleus.

As we go from Li to F, atomic radius of the atoms will DECREASE. This is due to increased nuclear charge (number of protons within each atom). Although the number of electrons also increases, each addi...