Which atom woukd tend to lose one valence electron to another atom to become stable

If you are saying losing an electron, so yes every atom needs to be in octate stage(8 electron) in outermost shell and if any atom have one extra electron than it loses electron gains positive charge and became stable by completing octet or duplet. They are found in first column of periodic table.

Examples - Na(sodium)

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.

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explanation: