The fact that ice is less dense than water is related to the fact that .
Group of answer choices

the molecules are held to each other by covalent bonding

ice has a structure that is held together by hydrogen bonds

the structure of ice is much less orderly than that of water

ice has a structure in which water molecules are arranged randomly

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

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