One atom of helium has two protons in its nucleus. A neutral atom of helium also has two electrons.Know More
The number of protons in an element is equal to the element's atomic number. Helium has the atomic number 2, which means it has two protons. An element's atomic number appears directly above its symbol in some versions of the periodic table. In other versions, it appears in the top left corner of the element's square.
Helium was discovered by Sir William Ramsay in 1895. Its name is derived from the Greek word for "sun." This gas is found in the air, as well as in natural gas deposits.Learn more about Atoms & Molecules
A nitrogen atom contains seven protons. This is true of all isotopes of nitrogen; radioactive isotopes of the element vary only in their number of neutrons.Full Answer >
Helium has two valence electrons. As an element, helium is very stable and contains a single s-orbital on its outer shell.Full Answer >
The nucleus of helium contains two neutrons and two protons. Around the nucleus of helium there are two electrons in the 1s orbital. These have opposite spins.Full Answer >
Carbon has six protons, which determines its place in the periodic table. All chemical elements possess an atomic number like this, starting with hydrogen at the atomic number of one. Carbon is the element widely accepted as being the key component for life on Earth.Full Answer >