Periodicity

What is the atomic number of Lithium (Li)

Tags

NGSS.MS-PS1-1

Considering the periodicity of the periodic table, what is the atomic number of Magnesium (Mg)

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NGSS.HS-PS1-1

The horizontal rows are called

• periods

• family groups

Which statement describes the trends of electronegativity values in the periodic table?

• Values increase from left to right across a period and increase down a group.

• Values increase from left to right across a period and decrease down a group.

• Values decrease from left to right across a period and increase down a group.

• Values decrease from left to right across a period and decrease down a group.

Which physical property of elements is represented by y on the graph below?

• First ionization energy

• Ionic radius

• Atomic radius

• Electronegativity

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NGSS.HS-PS1-1

Which property generally decreases across period 3?

• Atomic number

• Electronegativity

• Atomic radius

• First ionization energy

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which pair of elements has the greatest difference in electronegativity?

• Cs and F

• Cs and Cl

• Cs and Br

• Cs and I

Why does electronegativity increase as you go across a period?

• The number of energy levels decreases.

• The nuclear charge increases.

• The number of valence electrons decreases.

• The ionization energy decreases.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Why does atomic radius increase as you go down a group?

• Because the number of energy levels increases.

• Because electrons get paired in the same orbital.

• Because the nuclear charge increases.

• Because the number of valence electrons increases.

Which equation represents the first electron affinity of chlorine?

• Cl(g) + e^- → Cl^-(g)

• Cl₂(g) + e^- → Cl^-(g)

• Cl⁺(g) + e^- → Cl(g)

• Cl(g) → Cl⁺(g) + e^-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2