The Periodic Table is a good reference - check out the atomic number !
Helium - 2 protons, Nitrogen - 7 protons
The number of protons defines the element. So if an atom has one proton, you will automatically know it is hydrogen. The number of neutrons or electrons will not change what element it is. Though if the question is asking, hydrogen with two protons is 3H, or tritium.
Your question is wrong because hydrogen is the lightest gas but other than that its the lightest nobel gas, and that's just cause its atoms don't have much to them, and neither dose its molecules. With an atomic mass of 2, its the second lightest substance there is, and therefore attracted by gravity the second least of anything, so its gonna be ontop of all other matter (exept hydrogen which has the atomic mass of one)
isotopes of helium, with helium-4 being the more common isotope found in nature. Helium-4 has two protons and two neutrons in its nucleus, while helium-3 has two protons and one neutron. Both isotopes have important applications in various fields, including cryogenics and nuclear research.
The molecular formula NO represents a single nitrogen atom bonded to an oxygen atom, while the molecular formula N2O represents two nitrogen atoms bonded to one oxygen atom. Thus, the composition and arrangement of atoms in the two molecules differ.
Helium is lighter than hydrogen. Helium has an atomic number of 2, which means it has two protons and two neutrons in its nucleus, making it lighter than hydrogen, which has only one proton in its nucleus.
According to Wikipedia neutral nitrogen has 7 protons, 7 neutrons, and 7 electrons. Nitrogen ions may have more or less electrons and other nitrogen isotopes may have more or fewer neutorns.
Helium has 2 positive protons in its nucleus.
One atom of helium contains 2 protons and 2 electrons. The most abundant isotope of helium, helium-4, has 2 neutrons. The other, rare isotope of helium, helium-3, has 1 neutron. (Source: Wikipedia)
Oxygen has 8 protons and Nitrogen has 7 protons the atomic number of an element which tell you how many protons an atom has is the lower one seen on each element on the periodic table.
The helium nucleus is larger than the proton. The He nucleus consists of two protons, and one (rarely) or two (most commonly) neutrons. (These are He-3 and He-4, respectively.) That would make the helium nucleus a multiple of three or four times the mass of that of a single proton.
The number of protons defines the element. So if an atom has one proton, you will automatically know it is hydrogen. The number of neutrons or electrons will not change what element it is. Though if the question is asking, hydrogen with two protons is 3H, or tritium.
The number of protons determines the element. So when neutrons are added, there is no change in the number of protons and helium atom is unchanged.
because the atom is a nitrogen one....not all atoms have seven protons in their nucleus
No. Nitrogen has an atomic number of 7, with a mass number of about 14, meaning it has 7 protons, 7 neutrons, and 7 electrons. Hydrogen has the least amount of protons, containing only one proton and one electron.
The gas is helium. Helium is inert and has 2 protons, while hydrogen has 1 proton.
Helium has a nucleus with 2 protons, 2 neutrons. It has only one energy level with 2 electrons in it.
The atomic number of helium (He) is 2. This means that helium has 2 protons in its nucleus.