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Why does helium have an atomic number of 2 and atomic mass of 4?
Wiki User
∙ 11y ago
An atom's atomic weight is the total of all protons and neutrons in its nucleus. Helium almost always contains two protons and two neutrons. Therefore, its atomic weight is 2 + 2 = 4.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoAtomic number = number of protons = 2 for helium
Mass number = number of protons + number of neutrons = 2 + 2 = 4
Wiki User
∙ 11y agoHelium has 2 protons. Atomic number is the number of protons.
Wiki User
∙ 11y agoBecause helium has 2 protons and 2 neutrons (for its most stable and most abundant isotope).
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4.002 is the atomic mass of which element?
We can find helium as a non metal element. Atomic number of it is 2.
What is the atomic number of a helium atom?
The atomic number of Helium is 2 because there are 2 protons and 2 electrons.
What is the atomic number and atomic mass number of the element that is formed in the following nuclear reaction that takes place in the sun?
The atomic number is 2, and the atomic mass is 4 (helium)
What is the atomic number for helium?
The atomic number of Helium is 2.
What is the superscript 4 for helium?
4He or He4. 4 stands for the mass number of Helium Mass number = number of protons + number of neutrons Since the atomic number or number of protons in helium is 2, the number of neutrons in He-4 is also 2.
What is helium's atomic?
Helium's atomic number is 2 and its atomic mass is 4
What is the atomic number and mass of helium?
Helium is a metal element. Atomic number of it is 2.
4.002 is the atomic mass of which element?
We can find helium as a non metal element. Atomic number of it is 2.
What is the atomic number of a helium atom?
The atomic number of Helium is 2 because there are 2 protons and 2 electrons.
What is the symobel and atomic number and atomic mass for helium?
Symbol: He atomic #: 2 atomic mass: 4.002602
What is the mass number of helium atom?
The atomic number of helium is 2. Its mass is 4.002602 u ± 0.000002 u
What has got 4 mass number and 2 atomic number?
Helium
What is atomic weight of helium?
4.002602 g/mol
How do you calculate mass number of an atom?
The atomic mass is the number of protons plus the number of neutrons. The number of protons is identical to the atomic number (as well as electrons, but these don't matter right now). So, let's take helium. It has 2 protons and 2 neutrons, therefore the atomic mass # of helium is 4. Helium weighs 4 Atomic Mass Units (AMU).
How did the helium got the mass number 4?
helium has 2 protons and 2 neutrons. so its atomic number is 4
What element has the atomic number of 2 and the mass number of 5?
helium yo
Draw atom with mass number 4 and atomic number 2?
Helium is a non metal element. Atomic mass number of it is 4.
