it goes from gas to solid
All the three states of matter are represented by the halogens.
They do Occur in SOLID,LIQUID and GAS
This not mandatory; see the halogens group.
YES
Iodine. If you mean the group of halogens, here's what Wikipedia writes about it: The halogens or halogen elements (/ˈhælədʒɨn/) are a group in the periodic table consisting of five chemically related elements, fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17. The group of halogens is the only periodic table group that contains elements in all three familiar states of matter at standard temperature and pressure. All of the halogens form acids when bonded to hydrogen. Most halogens are typically produced from minerals of salts. The middle halogens, that is, chlorine, bromine and iodine, are often used as disinfectants. The halogens are also all toxic.
All the three states of matter are represented by the halogens.
nothing
yes an element is matter
They do Occur in SOLID,LIQUID and GAS
"element" is a very confusing word for what you are asking. But what I think you are asking is what part of an atom does not change with an isotope. I'll answer that question. An isotope of an atom is a variation fo the element in which the atom has a different number of neutrons. However, the number of protons can never change in a single element. So no matter how many atoms of a certain element are gathered, no matter how many different isotopes there are, they all have the exact same number of protons.
This not mandatory; see the halogens group.
YES
"element" is a very confusing word for what you are asking. But what I think you are asking is what part of an atom does not change with an isotope. I'll answer that question. An isotope of an atom is a variation fo the element in which the atom has a different number of neutrons. However, the number of protons can never change in a single element. So no matter how many atoms of a certain element are gathered, no matter how many different isotopes there are, they all have the exact same number of protons.
yes gold is an element and is matterTrue.
Iodine. If you mean the group of halogens, here's what Wikipedia writes about it: The halogens or halogen elements (/ˈhælədʒɨn/) are a group in the periodic table consisting of five chemically related elements, fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The artificially created element 117 (ununseptium) may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17. The group of halogens is the only periodic table group that contains elements in all three familiar states of matter at standard temperature and pressure. All of the halogens form acids when bonded to hydrogen. Most halogens are typically produced from minerals of salts. The middle halogens, that is, chlorine, bromine and iodine, are often used as disinfectants. The halogens are also all toxic.
Physical. Melting is always a physical change.
chemical property chemical property