The two subatomic particles are protons and electrons. They match the atomic number on Periodic Table.
This particle is the proton.
NUmber of protons = Number of electrons = Atomic number Number of neutrons = Mass number - Atomic number
Electron. In a stable element the number of protons (+ charged subatomic particles) must match the number of electrons (- charged subatomic particles) and neutrons (neutral or uncharged subatomic particles). At least that's how I remember it from my school days.
The concept of atomic number had not yet been developed at the time of the first periodic tables, when atoms were still considered "indivisible units" and the concepts of protons, electrons, and neutrons were not yet known.
In this case, the number 209 represents the sum of protons + neutrons.
Subatomic particles are protons, neutrons and electrons; the number of protons and electrons (in the neutral state) are equal to the atomic number of an element.
Number of protons in the nucleus is the atomic number.
Every element has a different atomic number. With the periodic table, they could organize accordingly to the subatomic particles.
the number of protons
This particle is the proton.
Atomic number is same as the number of protons and number of electrons.
Neutrons are sub-atomic particles. The Periodic Table is an arrangement of the elements (atoms) made from these subatomic particles. Thus Neutrons by themselves have no place in the Periodic Table. However as all elements/atoms (except Hydrogen) contain some Neutrons, it is possible to find out how many using the information presented on the Periodic Table. The number of Neutrons present in an element/atom can be determined by subtracting the atomic number of an element/atom from its atomic mass.
The proton
False; the atomic number is the total number if protons in the nucleus only.
The number of protons is equal to the atomic number of a chemical element.
This particle is the proton which is equal to the atomic number.
Atomic Number is the amount of Protons (positively charged subatomic particles) contained in the nucleus of an atom.