The elements of which group are nonreactive? halogens alkaline earth metals noble gases alkali metals

noble gases

Explanation: The elements whose valence shell is already filled is stable and thus don not lose or gain electron and thus do not react.

Halogen is the name given to fluorine family which have 5 valence electrons and thus easily gain electrons to attain stable configuration.

Alkaline earth metal is the name given to group 2 elements which have 2 valence electrons and thus easily lose 2 electrons to attain stable configuration.

Noble gases is the name given to group 18 elements which have 8 valence electrons and thus do not lose or gain electrons and thus is non reactive.

Alkali metals is the name given to group 1 elements which have 1 valence electrons and thus easily lose 1 electron to attain stable configuration.

quartz

explanation:

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.