An atom that contains 3 protons, 4 nuetrons and 3 electrons has an atomic # of ???

Answer 1

atomic no. is equal to the no. of protons .
so in this question the no of protons is 3 so the atomic no. is 3.
atomic mass=no.of protons + no. of neutrons.
so atomic no. is 3+4=7.

Answer 2

Atomic number is 3 (3 Protons).
Atomic mass number of 7 (3 Protons + 4 Neutrons).

Answer 3

type of protons is the same as type of electrons (its a reality as + protons in an atom are cancelled with the same no. of - electrons). So it has 3 electrons The atomic mass is the mass of the nucleus, or in simple terms protons+neutrons, so it has a mass of 5 + 4 i.e. 9

Answer 4

It has an Atomic Number of 3

No matter when or where. The Atomic Number of an atom will ALWAYS equal to the number of Protons.

Just memorize; Atomic Number = Number of Protons

And you will be fine.


There is another thing called Atomic Mass, and atomic mass is the sum off protons and neutrons (atomic mass = protons + neutrons). It is important to know the difference between the Atomic Number and Atomic Mass.


Here is an easy reference to use;

Atomic Number = Number of Protons

Atomic Mass = Number of Protons +Number of Neutrons

Electrons = Number of Protons




.

Answer 5

3. The atomic number= number of protons.

Answer 6

3-protons only