Explain why magnesium ( $$Mg$$ ) forms a $$2+$$ ion rather than a $$1+$$ ion.

It is easier to lose two electrons to achieve a noble gas configuration.

It is easier to gain one electron.

It is more stable with one electron in the outer shell.

A student claims that the atomic radius of chlorine is larger than that of sodium. Use periodic trends to evaluate this claim.

The claim is incorrect because atomic radius decreases across a period, so sodium is larger.

The claim is correct because chlorine is to the right of sodium.

The claim is correct because chlorine has more protons.

The claim is incorrect because atomic radius increases across a period.

Which of the following best explains why noble gases are generally unreactive?

They have a full valence shell, making them stable.

They have incomplete outer shells.

They have low ionization energies.

They have high electronegativities.

Predict which element, potassium or calcium, will have a higher second ionization energy and explain why.

Potassium, because removing a second electron breaks a stable noble gas configuration.

Calcium, because it has more protons.

Potassium, because it is further to the left in the period.

Calcium, because it is a metal.

What is the electron configuration for a neutral atom of phosphorus ( $$P$$ )?

1s $$^2$$ 2s $$^2$$ 2p $$^6$$ 3s $$^2$$ 3p $$^3$$

1s $$^2$$ 2s $$^2$$ 2p $$^6$$ 3s $$^2$$ 3p $$^5$$

1s $$^2$$ 2s $$^2$$ 2p $$^6$$ 3s $$^2$$ 3p $$^4$$

1s $$^2$$ 2s $$^2$$ 2p $$^6$$ 3s $$^1$$ 3p $$^3$$

Exploring Quantum Numbers And Trends

Exploring Quantum Numbers and Trends

Authored by Rebecca L Imre

Science

9th Grade

NGSS covered

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which quantum number describes the main energy level of an electron in an atom?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Neon

Oxygen

Carbon

Sodium

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a noble gas?

Nitrogen

Argon

Fluorine

Magnesium

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which rule states that electrons fill the lowest energy orbitals first?

Hund’s Rule

Pauli Exclusion Principle

Aufbau Principle

Octet Rule

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

NGSS.HS-PS1-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following elements has the largest atomic radius?

Lithium

Sodium

Potassium

Rubidium

Tags

NGSS.HS-PS1-1

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Exploring Quantum Numbers and Trends

Which quantum number describes the main energy level of an electron in an atom?

Which of the following is a noble gas?

Which rule states that electrons fill the lowest energy orbitals first?

Which of the following elements has the largest atomic radius?

Which of the following ions has the same electron configuration as neon?

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