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# If an element has a mass number of 4 and an atomic number of 2 how many neutrons does the element have?

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# If you know the atomic mass and atomic number of a element how do you determine the number of neutrons in the element?

Number of Nuetrons = Mass Number - Atomic Number E.g. Einsteinium (Mass Number) 252 - (Atomic Number) 99 = 153 Neutrons Or just look at how many protons and neutrons are in

# How do you find the atomic mass of an element when the number of neutrons is unknown?

  Atomic number minus number of protons   you don't

# Atomic number of 2 and atomic mass of 4 how many neutrons?

To find the number of neutrons simply subtract the atomic number from the atomic mass. In this case there are two neutrons.

# What is the atomic number the atomic mass and the number of neutrons of the element hydrogen?

  The 'standard' hydrogen atom has atomic number 1, atomic mass 1, no neutrons. Although there are 2 other isotopes of hydrogen: - (cant confirm name) which has atomic

# What is the atomic number and the mass number of an atom of an element with 5 protons and 6 neutrons?

The atomic number of an element is the number of protons it has in its nucleus. In this case, it would be 5. The atomic weight is the sum of the protons and neutrons in its

# If the atomic number of an element is 9 and the mass number is 19 how many neutrons does the atom have?

  atomic number = number of protons mass number = # protons + # neutrons # neutrons = mass # - atomic # = 19 - 9 10 neutrons

# How many neutrons does an element with an atomic number of 55 contain?

This question can not be properly answered unless a specific isotope of the element is specified. The number of neutrons is always equal to the mass number of the isotope minu

Beryllium (Be)

# Is the atomic mass and atomic number of an element used to determine the number of neutrons?

Yes. If you subtract the atomic number from the atomic mass you get the number of neutrons.

# How many neutronsÂ are there inÂ an element having a mass number of 52 and an atomic number of 22?

30. The Atomic mass is essentially the protons + neutrons. The Atomic number is the protons. Or the neutrons. Or even the electrons. With the exception of ions and isotopes, t

# How many neutrons does an element have if the proton number is 15 and its atomic mass is 31?

31 - 15 = 16 neutrons

# What is the mass number of an element with four protons and 4 neutrons?

8. Mass number is the number of protons and neutrons in an atomic nucleus.

helium yo

beryllium (Be)

# How many neutrons are there in an element having a mass number of 155 and an atomic number of 63?

The number of neutrons in the nucleus of an atom is always the difference between the mass number of the atom and the atomic number of the atom. Therefore, in this instance, t

# Why is the atomic mass of an element determined by the number of protons and neutrons?

The sum of the protons and neutrons in the atoms of an isotope is called the mass number of that isotope.

rhodium