# How do you find valence electrons and charges?

## How do you find valence electrons and charges?

For neutral atoms, the number of valence electrons is equal to the atom’s main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons. Oxygen is in group 6 and has 6 valence electrons.

How do you know the charges of transition metals?

To determine the charge on a given transition metal atom, you have to consider what element it is, the charges on the other atoms in the molecule, and the net charge on the molecule itself. The charges are always whole numbers, and the sum of all the atomic charges equals the charge on the molecule.

### How many valence electrons are there in each of these elements?

Examples include hydrogen (H), lithium (Li), and sodium (Na). Any element in group 18 has eight valence electrons (except for helium, which has a total of just two electrons). Examples include neon (Ne), argon (Ar), and krypton (Kr). Oxygen, like all the other elements in group 16, has six valence electrons.

How do you know charges of elements?

There are four ways to find the charge of an element:

1. Use the periodic table. The usual charge of an element is common to its group.
2. Use a chart.
3. For a single atom, the charge is the number of protons minus the number of electrons.
4. Find the charge by balancing charge in a compound.

## How do you determine the charge of a transition metal cation from the formula of an ionic compound containing that cation?

How do you determine the charge of a transition metal cation from the formula of an ionic compound containing that cation? Determine the charge of the anion, then work backwards to find the charge of the transition metal cation needed to give a net charge of zero for the formula unit.

How can I find valence electrons of transition metals?

Most transition metals have 2 valence electrons. Valence electrons are the sum total of all the electrons in the highest energy level (principal quantum number n). Most transition metals have an electron configuration that is ns2(n−1)d, so those ns2 electrons are the valence electrons. For example.

### Can a group number tell you the valence of an element?

Once again, the group number of the element you are examining can tell you its valence electrons. However, for the transition metals, there isn’t a pattern you can follow — group number will usually correspond to a range of possible numbers of valence electrons.

What is the 18 electron rule for transition metals?

• Transition metal complexes follow the 18 electron rule, appropriate for an atom having 9 valence orbitals, e.g. a first row transition metal has one 4s, three 4p and five 3d valence orbitals: Cr0+ 6CO = Cr(CO) 6 (6 valence e−−−−) + [6 x(2 valence e−−−−)] = 18e−−−−

## How to find valence electrons without periodic table?

To solve without a periodic table, find the electron configuration of the element and count the electrons into 1 group of 2, and then into shells of 8. The number in the last group is the amount of valence electrons. Read on for in-depth explanations and examples.