There are two naturally occurring isotopes of helium: He-3 (which is very rare, comprising 0.00014% of naturally occurring helium), and He-4 (which comprises the other 99.99986%of naturally occurring helium).
Whether helium is one type of atom or not then depends on the definition of "one type of atom"; if He-3 and He-4 are considered different types of atom due to their differing numbers of neutrons, then no, helium is not one type of atom; if He-3 and He-4 are both considered the same type of atom due to their common number of protons, then yes, helium is one type of atom.
Helium is an element made of only one type of atom. Water and sugar are made up of different types of atoms (molecules), while air is a mixture of different gases.
One type of substance that contains only one type of atom is an element. For example, helium (He) is a noble gas that consists solely of helium atoms. Elements are the simplest forms of matter and cannot be broken down into simpler substances by chemical means. Each element is defined by its unique number of protons in the atomic nucleus.
When a helium atom loses an electron, it forms a helium ion which is positively charged because it has one less electron than protons. This helium ion is written as He+.
Of the listed items, water and carbon dioxide are compounds, not elements. The others (mercury, iron, helium, oxygen, carbon, and bromine) all have more than one isotope. So none of the listed materials have "one type of atom."
Helium is pure as it is on the periodic table.
What is composed of only one type of molecule
No, helium gas is not a compound. Helium is an element, which means it consists of only one type of atom.
Helium is an element made of only one type of atom. Water and sugar are made up of different types of atoms (molecules), while air is a mixture of different gases.
A pure substance made of only one type of atom is an element.An element, or elementary substance.An element.
"Atom" implies there's only one there. If there were more than one atom, you'd have a compound. Since helium's an element, all that's in it is helium.
Helium is an element because it contains only one atom in its simplest form.
One type of substance that contains only one type of atom is an element. For example, helium (He) is a noble gas that consists solely of helium atoms. Elements are the simplest forms of matter and cannot be broken down into simpler substances by chemical means. Each element is defined by its unique number of protons in the atomic nucleus.
Elements on the periodic table contain only one type of atom. Each element is defined by the number of protons in its nucleus, such as hydrogen (H) with one proton, helium (He) with two protons, and so on.
Helium is an element (and therefore a pure substance) yes
Elements that contain only one type of atom are called pure elements or monatomic elements. For example, helium (He), neon (Ne), and oxygen (O) are pure elements because they consist of only one type of atom in their chemical structure.
No, helium is a pure substance and an element to be more specific. It has a constant composition making it a pure substance and it is homoatomic (has only one type of atom) which makes it an element.
When a helium atom loses an electron, it forms a helium ion which is positively charged because it has one less electron than protons. This helium ion is written as He+.