Atomic structure and electronic configuration

What is the electronic configuration for Phosphorus atom ?

• 1s²2s²2p⁶3s²3p³

• 1s²2s²2p⁶3s²3p⁵

• 1s²2s²2p³

• 1s²2s²2p⁶3s²

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Which of the following is the electronic configuration for Mg²⁺ ion?

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶ 3s² 3p²

• 1s² 2s² 2p⁶ 3s²

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Which one of the following is the electronic configuration of the bromine atom?

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s¹4p⁶

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁷

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵

• 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶

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Which one of the following does not represent the electronic configuration of an atom in its ground state?

• 1s² 2s² 2p³

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁶ 3s¹

• 1s² 2s² 2p⁶ 3d¹

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Which one of the following contains no unpaired electrons in the ground state?

• Be

• F

• Si

• N

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The number of electrons in the 3d orbital of the atom of atomic number 27 is

• 5

• 6

• 7

• 10

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The vanadium atom (atomic number 23) in its ground state has the electronic configuration:

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³ 4s²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s³

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹ 4s² 4p²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s² 4p¹

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What atom matches this electron configuration?
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰

• Zinc
• Copper
• Nickel
• Germanium

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What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

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An orbital can at most hold how many electrons?

• 1 electron
• 2 electrons
• 3 electrons
• 4 electrons