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They use a mass spectrometer.
The atomic number equals the number of protons in the nucleus of the atom. It required a bit of work to figure out originally (the mole number and Avogardo played a big part).
The trouble with the mass spectrometer is that it works with compounds as well as elements ... it was a late development.
What else can I help you with?
How can you determine the number of electrons in an element?
To determine the number of electrons in an element, you can look at the atomic number of the element on the periodic table. The atomic number represents the number of protons in the nucleus of an atom, which is equal to the number of electrons in a neutral atom.
How do you determine the number of neutrons in an element?
To determine the number of neutrons in an element, subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number). Neutrons are neutral particles found in the nucleus of an atom.
To determine the number of neutrons in an atom, what must be done?
To determine the number of neutrons in an atom, subtract the atomic number (number of protons) from the atomic mass number (rounded mass of the atom). Neutrons are particles found in the nucleus of an atom and carry no charge.
How can one determine the number of electrons in an element?
To determine the number of electrons in an element, you can look at the element's atomic number on the periodic table. The atomic number represents the number of protons in the nucleus of an atom, which is equal to the number of electrons in a neutral atom.
Can you determine the element with only knowing the number of protons?
The number of protons is the "atomic number", so you look that up in the periodic table.
How you can determine the number of protons electrons and neutrons an atom has from an atom's mass number and its atomic number?
To determine the number of protons, look at the atomic number. The number of electrons is also the atomic number.To find the number of neutrons subtract the atomic number from the Atomic Mass number.
Which particle determines the atomic number of an element?
The atomic number of an element is determined by the number of protons.
How do scients determine the atomic number of an atom?
the atomic number is determined by the number of protons in a nucleus.
What determine the atomic number of atom?
The number of protons
What do we do to determine the number of neutrons in a atom?
atomic number
What 2 subatomic particles can you determine from the atomic number?
Atomic number is same as the number of protons and number of electrons.
By knowing the atomic number how can we determine the charge of the nucleus?
All atomic nuclei are electrically positive.The number of protons is equal to the atomic number.
The number of these will determine it's atomic number?
The atomic number of any atom is determined by the number of protons in the nucleus of the atom.
How do you determine the number of proton?
The atomic # is the same as the number of protons
Is the atomic number determine by the number protons in an atom?
yes...
Which mass number or atomic number determine what element an atom is?
The identity of the element is determined solely by the atomic number, which is the number of protons.
Is the element determine by the number of protons?
The atomic number is equal to the number of protons.
