Electron Configuration Review

What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc

• Copper

• Nickel

• Germanium

Answer explanation

The electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ corresponds to Zinc, which has an atomic number of 30. This configuration indicates a complete filling of the first three shells and the 4s and 3d subshells.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

What atom matches this electron configuration?
1s²2s²2p⁶3s²

• Neon

• Magnesium

• Aluminum

• Potassium

Answer explanation

The electron configuration 1s² 2s² 2p⁶ 3s² corresponds to Magnesium, which has 12 electrons in total. Neon has 10 electrons, Aluminum has 13, and Potassium has 19, making Magnesium the correct match.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Answer explanation

An oxygen atom has 8 electrons. Its electron configuration is 1s² 2s² 2p⁴, which corresponds to the choice 1s² 2s² 2p⁴. The other options either exceed the number of electrons or represent different elements.

Tags

NGSS.HS-PS1-1

How many electrons does Si contain? (click to see image)

• 14

• 28

• 2

• 4

Answer explanation

Silicon (Si) has an atomic number of 14, which means it contains 14 electrons. This is because the number of electrons in a neutral atom is equal to its atomic number.

Tags

NGSS.HS-PS1-1

How many electrons can the first energy level hold?

• 1

• 2

• 8

• 0

Answer explanation

The first energy level, also known as the K shell, can hold a maximum of 2 electrons. This is determined by the formula 2n², where n is the energy level number. Therefore, the correct answer is 2.

What do you start all electron configurations with?

• 1s²

• 1d¹⁰

• 1f¹⁴

• 1p⁶

Answer explanation

All electron configurations start with 1s², which represents the first energy level and the s subshell containing 2 electrons. The other options (1d, 1f, 1p) are not valid starting points for electron configurations.

Tags

NGSS.HS-PS1-1

Which electron configuration belongs to Chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁷

Answer explanation

Chlorine (Cl) has an atomic number of 17, meaning it has 17 electrons. The correct electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁵, which accounts for all 17 electrons. The other options exceed the electron count.

Tags

NGSS.HS-PS1-1

The 4 orbitals are

• s, p, d, f

• a, b, c, d

• 2, 4, 6, 8

Answer explanation

The four types of orbitals in atomic theory are s, p, d, and f. These orbitals describe the shapes and energy levels of electrons in an atom, making 's, p, d, f' the correct answer.

How many d orbitals are there in a given sublevel?

• 1

• 3

• 5

• 7

Answer explanation

In a given sublevel, there are 5 d orbitals. These orbitals are designated as dxy, dyz, dzx, dx2-y2, and dz2, allowing for various orientations in three-dimensional space.

How many p orbitals are there in a sublevel?

• 2

• 1

• 4

• 3

Answer explanation

In a sublevel, there are three p orbitals: px, py, and pz. Each p orbital can hold a maximum of two electrons, making the total number of p orbitals in a sublevel equal to 3.