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Only one. The first shell can have up to 2 electrons.

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How many shells does 10 electrons need?

10 electrons would need 2 shells to accommodate them. The first shell can hold up to 2 electrons, while the second shell can hold up to 8 electrons.


16 electrons need how many shells?

16 electrons would fill up the first four shells in an atom: 2 electrons in the first shell, 8 electrons in the second shell, 4 electrons in the third shell, and 2 electrons in the fourth shell.


How many electrons does an atom of oxygen need to complete its outer shell?

An atom of oxygen needs 2 electrons to complete its outer shell, which can hold a total of 8 electrons. Oxygen has 6 electrons in its outer shell, so it will gain 2 electrons through bonding to achieve a full valence shell.


How many electrons does oxygen need to fill its outer shell?

Oxygen needs 2 electrons to fill its outer shell, which is the second electron shell. This shell can hold a maximum of 8 electrons. Oxygen has 6 electrons in its neutral state, so it will gain 2 electrons to achieve a stable electron configuration similar to a noble gas.


How many shells do 20 electrons need?

20 electrons would need 4 shells. The first shell can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third shell can hold up to 18 electrons, and the fourth shell can hold up to 32 electrons.


How many shell do 4 electrons need?

the first shell holds 2 and the second one holds 8 so you would need 2 shells!


How many electrons does He and Ca have in its outer shell?

Helium (He) and Calcium (Ca) both have 2 valence electrons.


How many electrons are there in the L shell of neon?

2 electrons in the K shell and 8 electrons in the L shell


How many electrons go in the first shell of oxygen?

In the first shell there are two electrons and in the second shell there are six electrons, but only the electrons in the second (outer) shell are valence electrons.


How many electrons on the outermost shell of calcium?

There are 2 electrons on the outermost shell of calcium.


How many electrons in each shell does Phosphorus have?

Phosphorous has 2 elements in K-shell, 8 in L-shell and 5 in M-shell.


What is the numbers of electrons in each shell?

According to one of Lewis' theories, each shell has a maximum number of electrons using the formula 2n2 where n = the shell number. For example: 1st shell = 2(1)2 = 2 electrons maximum; 2nd shell = 2(2)2 = 8 electrons maximum.