Helium.
Compound
Peroxide is not an element but it is an ion
Hydrogen bromide is a compound, not an element. It is made up of hydrogen and bromine atoms chemically bonded together.
Hydrogen is an element, not a molecule. It is the first element on the periodic table, with the symbol H and atomic number 1. However, hydrogen can form molecules when two hydrogen atoms bond together, such as in H2.
Hydrogen is an element because it is made up of only one type of atom, which is hydrogen itself. When two hydrogen atoms bond together, they form a hydrogen molecule (H2). So, hydrogen can exist as both an element and a molecule.
Compound
Peroxide is not an element but it is an ion
Hydrogen bromide is a compound, not an element. It is made up of hydrogen and bromine atoms chemically bonded together.
Hydrogen is an element, not a molecule. It is the first element on the periodic table, with the symbol H and atomic number 1. However, hydrogen can form molecules when two hydrogen atoms bond together, such as in H2.
Hydrogen is an element because it is made up of only one type of atom, which is hydrogen itself. When two hydrogen atoms bond together, they form a hydrogen molecule (H2). So, hydrogen can exist as both an element and a molecule.
All atoms in the beginning were hydrogen atoms.
No. HCl is the chemical formula for hydrochloric acid, which is a compound. H, hydrogen, is an element. Cl, chlorine, is an element. But together they are not. Together they are hydrochloric acid
Molecular hydrogen has two atoms, both which are of the same element - hydrogen.
No. Although hydrogen is an atom, it doesn't exist by itself (except as an ion). Hydrogen gas is a hydrogen molecule made of two hydrogen atoms.
The energy in stars comes from nuclear fusion. Hydrogen atoms are continually fused together to created helium and with it, massive amounts of energy.
The diatomic element in period 1 of the periodic table is hydrogen (H). It exists as H2, meaning two hydrogen atoms are bonded together.
Well with any element when two atoms are put together they are known as a molecule of that element. So one atom of hydrogen is known as one atom of hydrogen and two atoms of hydrogen is known as one molecule of hydrogen.