Most helium has a mass number of 4. The rare 3He isotope has a mass number of 3.
The mass number is the integer total of protons and neutrons for a given isotope. For example radioactive carbon-14 has a mass number of 14, while carbon-12 (the most common stable form) has a mass number of 12.
The mass number of an element is the sum of the number of protons and neutrons in the nucleus of an atom. For an atom with a mass number of 15.9994, it indicates the average atomic mass of an oxygen atom.
Mass number is the atomic mass of a particular isotope (apex chem 5.3)
In order to calculate the number of neutrons, you subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number). Neutrons are important for stabilizing the atomic nucleus alongside protons.
Mass number: 14 Atomic/proton number: 7 If you look at the periodic table, the mass number is the top and the atomic number is the bottom number.
The mass number of krypton is 84.
Hydrogen has atomic number 1 whereas helium's is 2.
liquid, and gas.
gaseous state.
Helium is an odorless gas.
Helium's chemical symbol is He.
-268.93 °C
helium is a colourless odourless gas
Helium is a gas at room temperature.
heliums period address is 11.09
The Heliums period is a explosive force of matter which produces nano bits of helium. The shockwave contributes to events here on Earth. Scientists are still trying to decode the main details.
The mass number of Am-241 is 241; each isotope has another mass number.
Atomic mass is the number of protons in an atom mass number is the number of protons plus neutrons in an atom the number of neutrons would equal the mass number minus the atomic number.