Because the world is made up like this.
Well, a 18O, as it's name shows, has a releatve mass of 18 units. A proton has got a mass of 1 ,a neutron ahd got a mass of 1, and electron has gor a amss of 1/1840 (we dont calculate with a this small mass). So in a 18 relative mass, neutrons + protons = 18. As oxygen is the 8th in the Periodic Table, it has got 8 atoms. So neutrons + 8 = 18, where neutrons = 10.
The phosphorus atom has 15 protons and electrons and 16 neutrons.
Each atom has a unique combination of protons, neutrons, and electrons.
This isotope has 20 protons and and electrons and 22 neutrons.
6 electrons, protons, and neutrons.
Protons: 10 Neutrons: 10
An atom of potassium has 19 protons, 19 electrons, and typically 20 neutrons.
4 protons 4 electrons 5 neutrons
The phosphorus atom has 15 protons and electrons and 16 neutrons.
In a fluorine atom: 9 protons, 10 neutrons, and 9 electrons.
If the atom is neutral, then it will have 15 electrons to balance the 15 protons.
That atom is Arsenic. It would have 33 electrons.
In an atom of gold, there are 79 protons and 79 electrons. The number of neutrons for gold may vary by isotope.
Each atom has a unique combination of protons, neutrons, and electrons.
6 electrons, protons, and neutrons.
This isotope has 20 protons and and electrons and 22 neutrons.
Protons: 10 Neutrons: 10
Arsenic is a non metal element. There are 33 electrons in a single atom.