difference btwn atomic mass n atomic no?

atomic mass is the weight of an atom (protons+neutrons, but don't count electrons because they are so small) and the

atomic number is equal to how many protons an atom has

Atomic number is equal to the number of protons in an atom. The atomic number for an element never changes.

Atomic mass (or weight) is equal to sum of the masses of all of the particles--protons, neutrons, and electrons--in an atom. Practically speaking you count just the protons and neutrons; electrons weigh next to nothing compared to them. The same element can have different atomic weights; these are called isotopes, which have varying numbers of neutrons with the number of protons remaining constant.

To illustrate: Carbon always has an atomic number of 6, but is found as both Carbon-12 (the common form, 6 p and 6 n so atomic weight of 12) and Carbon-14 (a carbon isotope used for "carbon dating", 6p and 8n so atomic weight of 14).

Definition:

1)Atomic number is the number of protons in the nucleus of an atom. It is also equal to the number of electrons since the atom is electrically neutral.

2)atomic mass is the total number of neutrons and protons present in the nucleus of an atom.

atomic mass-

1)it is mass of an atom which we get by adding neutrons and protons and electrons.

2)since electrons are very light, so when calculating atomic mass ,we ignore the mass of electrons

3)most of the times , it is double the atomic no. of an atom.

4)atomic mass = neutrons + electrons

atomic no, =

1)it is equal to the no. of protons present in the nucleus of an atom..

2) most of times , it can be equal to no. of electrons in atom if atom has no charge.

3) atomic no. = no. of protons = atomic mass - neutrons

atomic # = number of protons in an atom

atomic mass = mass of an atom

atomic mass number = # protons + # neutrons

atomic mass listed on a periodic table = weighted average atomic mass over all stable isotopes

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note... there is a difference between atomic mass, atomic mass number and the mass listed on a periodic table.

these two statements are incorrect..

1) atomic mass = # protons + # neutrons

2) electrons are not included in atomic mass.

these are correct...

atomic mass = mass of the atom

atomic mass = mass protons + mass neutrons + mass electrons - nuclear binding energy + relativistic mass, etc.

this is usually true..

atomic mass ≈ # protons + # neutrons

this is rarely true...

weighted average atomic mass (ie mass listed on a periodic table) - atomic # = # neutrons.

Atomic mass - it is the total number of proton or electron present in an atom. Number of proton is equal to number of electron.

Atomic mass - It is the sum of number of neutrons and protons (or electrons).

= no. of neutrons + no. protons

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