# How many electrons can exist in an orbital?

This tells us that each subshell has double the electrons per orbital. The s subshell has 1 orbital that can hold up to 2 electrons, the p subshell has 3 orbitals that can hold up to 6 electrons, the d subshell has 5 orbitals that hold up to 10 electrons, and the f subshell has 7 orbitals with 14 electrons.
A.

### How many electrons can be placed in the 2s sublevel?

The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
• #### What is the maximum number of electrons that can occupy the third energy level?

Each principal energy level above the first contains one s orbital and three p orbitals. A set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. Therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.
• #### How many 2p electrons are in an atom of each element p?

The p orbital can hold up to six electrons. We'll put six in the 2p orbital and then put the next two electrons in the 3s. Since the 3s if now full we'll move to the 3p where we'll place the remaining three electrons. Therefore the Phosphorus electron configuration will be 1s22s22p63s23p3.
• #### What are the p orbitals?

At the first energy level, the only orbital available to electrons is the 1s orbital, but at the second level, as well as a 2s orbital, there are 2p orbitals. A p orbital is shaped like 2 identical balloons tied together at the nucleus. The orbital shows where there is a 95% chance of finding a particular electron.
B.

### How many electrons are allowed in each shell?

Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to 2(n2) electrons.
• #### Which elements have only one valence electron?

A: Any element in group 1 has just one valence electron. 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).
• #### What atom has the electron configuration 2 8 5?

Electron structure of the first 20 elements
ElementAtomic numberElec- trons in 1st shell
Boron52
Carbon62
Nitrogen72
Oxygen82
• #### How can you determine the number of electron shells in an atom?

Shell 2 (2S & 2P) and Shell 3 (3S & 3P) each hold 8 electrons. After that, the next 2 hold 18 each, then the next 2 hold 32. So far, scientists haven't discovered any elements that use more orbitals than this. As for "how many shells the atom has," I already said that it has an infinite number of empty ones.
C.

### How many electrons does 5f hold?

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. Thus, the answer is B. Do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. Each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.
• #### What is the maximum number of electrons in 2s?

Maximum number of orbitals in an energy level (n2)
Principal Energy Level (n)sublevelselectrons
11s2
22s 2p2 + 6
33s 3p 3d2 + 6 +10
44s 4p 4d 4f2 + 6 + 10 + 14
• #### How many electrons can exist in an orbital?

This tells us that each subshell has double the electrons per orbital. The s subshell has 1 orbital that can hold up to 2 electrons, the p subshell has 3 orbitals that can hold up to 6 electrons, the d subshell has 5 orbitals that hold up to 10 electrons, and the f subshell has 7 orbitals with 14 electrons.
• #### How many valence electrons are in a neutral atom of lithium?

Lithium has atomic number of 3. So a neutral lithium atom has 3 protons and 3 electrons. Two electrons in shell 1 and one electron in shell 2.

Updated: 26th October 2019