-1
An element you have a +2 charge It is had lost electrons. It would have to lose the same number of electrons that its positive charge is. So it would have lost 2 electrons.
An element with 46 protons and 44 electrons would have a net positive charge. This is because protons are positively charged and electrons are negatively charged. The difference between the number of protons and electrons is 2, resulting in a net charge of +2. Thus, the element would be a cation with a charge of +2.
Mahnesium is a bivalent element; the cation has the electrical charge 2+.
When "x" valence electrons are lost the charge is +x When "x" valence electrons are gained the charge is -x for example, if chlorine gained one electron, the charge would be Cl 1- or, if magnesium lost two electrons, the charge would be Mg 2+
The charge an element would have if it lost or gained electrons
The number of electrons in an atom is equal to the number of protons in the nucleus, which is 17 in this case. This ensures that the atom is electrically neutral, as the positive charge of the protons is balanced by the negative charge of the electrons.
A Calcium ion with a -1 net charge would have 21 electrons. Calcium as a stable element has 20 electrons.
The charge will be +2.
There is no element with a "charge of 18". Charges are determined by electrons, so for an atom to have a charge of ±18, it would have to lose or gain 18 electrons - something an atom wouldn't do. Perhaps you mean atomic number of 18, which would be argon or Ar.
Beryllium is element 4, so the "neutral" atom would have 4 protons and 4 electrons. In order to have a "-2" charge, it would need 6 electrons.
The element is vanadium (V) because it has 23 protons. With 18 electrons and a net charge of 3 plus, it would have lost 3 electrons, resulting in a net charge of +3. The number of neutrons (28) does not affect the charge or identity of the element.
To find the total number of electrons in an element, first you need to look up the element's atomic number. That number tells you how many protons are in the element. Then, look up the net charge of the element. The number of protons subtracted by the elements net charge will give you the number of its electrons.