Electrons are so small they contribute nothing to Atomic Mass. So since atomic number of 9 is the number of protons and atoms are generally neural it needs 9 to cancel out the positive charges of the protons.
There would be 19 protons. If it is a neutral atom, there would also be 19 electrons. Any other number of electrons would give it a charge and it would become an ion, although the atomic number would stay the same, as it refers only to the number of protons.
To maintain the electrical neutrality of an atom in the ground state, the number of protons should equal the number of electrons. So in an atom that has 19 protons there should also be 19 electrons.
There are 9 electrons as this is not a charged species. Electrons will equal protons unless there is a charge difference.
This is an isotope, meaning there are 10 neutrons.
potassium or k
8
The atomic number for hydrogen (H) is 1, and it has 1 electron in the outer shell.
Chlorine is a chemical element with the symbol Cl and an atomic number of 17. It has 7 electrons in its outer shell.
Its atomic number is 7, and so it needs a further 3 electrons to fill its outer shell.
No, the atomic number of oxygen is 8 because it has 8 protons in its nucleus.Oxygen has two electrons in its inner electron shell and 6, not 8, electrons in its outer shell. The fact that it has space for two more electrons before the outer shell is filled is the reason oxygen takes part in the chemical reactions that it does.
Its elemental weight
The atomic number for hydrogen (H) is 1, and it has 1 electron in the outer shell.
Chlorine is in period three because that is how many outer shells it has. One period is one shell... In the First outer shell you can only hold.. 2 electrons. Second outer shell can hold 10 electrons. Third outer shell can hold 18 electron. Protons + Electrons = Atomic Number Atomic Number - Atomic Mass = Number of Neutrons in Outer Shells
Chlorine is a chemical element with the symbol Cl and an atomic number of 17. It has 7 electrons in its outer shell.
Nitrogen has atomic number = 7. The outer shell has 5 electrons, it requires 3 more electrons to complete the outer energy shell.
Its atomic number is 7, and so it needs a further 3 electrons to fill its outer shell.
Elements in the same group have the same number of valence electrons. These are the outer-shell electrons that react with other elements.
There are four electrons found on the outer shell of a atomic structure of tin. They are in a group of four.
No, the atomic number of oxygen is 8 because it has 8 protons in its nucleus.Oxygen has two electrons in its inner electron shell and 6, not 8, electrons in its outer shell. The fact that it has space for two more electrons before the outer shell is filled is the reason oxygen takes part in the chemical reactions that it does.
Its elemental weight
the reactivity of depends on the number of its outer shell electrons. one all outer shell electrons are there then there is little reactivity. If the atomic number is 19 then the element will 19 protons and 19 electrons. this means it has 2 electrons in the 1st shell 8 in the second 8 in the 3rd and 1 in the last. as it only has one it will be very reactive =)
The outer shell of helium does not have an atomic number, that number belongs to helium itself whose atomic number is 2.
No. Argon has eight electrons in its outer shell and magnesium has two electrons in its outer shell.