Answer:
Atoms must have similar electronegativities in order to share electrons in a covalent bond.
Explanation:
Covalent bonding is one of the bondings that occurs between the atoms of elements. It is the bonding in which atoms share their valence electrons with one another. However, the ELECTRONEGATIVITY, which is the ability of an atom to be attracted to electrons play a major role in the formation of covalent bonds.
When atoms of different electronegativities combine, the more electronegative atom pulls more electrons towards itself, hence, an IONIC bond is formed. However, when the electronegativities of the atoms are similar, the sharing of their electrons becomes stronger. Hence, ATOMS MUST HAVE SIMILAR ELECTRONEGATIVITIES in order to share electrons in a covalent bond.
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The reaction in which more reactive element replace a less reactive element from its compound is called displacement reaction.
Ex:-

I dont understand , what u write
One is ocean
Two is green house effect is the trapping of gas in the atmosphere and global warming is the heating of the earth
Three is option one
Answer:
ZINC CHLORATE
Explanation:
Zinc chloride is the name of chemical compounds with the formula ZnCl2 and its hydrates.