Periodicity

Which pair of elements reacts most readily?

• Li + Br2

• Li + Cl2

• K + Br2

• K + Cl2

The compounds Na₂O, Al₂O₃ and SO₂ respectively are

• acidic, amphoteric and basic.

• amphoteric, basic and acidic

• basic, acidic and amphoteric

• basic, amphoteric and acidic

Which of the following properties of the halogens increase from F to I? *

I. Atomic radius, II. Melting point, III. Electronegativity

• I only

• I and II only

• I and III only

• I, II and III

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

For which element are the group number and the period number the same?

• Li

• Be

• B

• Mg

Which of the physical properties decrease with increasing atomic number for both the alkali metals and the halogens?

I. Atomic radius

II. Ionization energy

III. Melting point

• I only

• II only

• III only

• I and III only

Tags

NGSS.HS-PS1-1

Which of the reactions below occur as written? *

I. Br₂ + 2I^– → 2Br^– + I₂

II. Br₂ + 2Cl^– → 2Br^– + Cl₂

• I only

• II only

• Both I and II

• Neither I or II

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Rubidium is an element in the same group of the periodic table as lithium and sodium. It is likely to be a metal which has a

• high melting point and reacts slowly with water.

• high melting point and reacts vigorously with water.

• low melting point and reacts vigorously with water.

• low melting point and reacts slowly with water.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When the following species are arranged in order of increasing radius, what is the correct order?

• Cl^–, Ar, K⁺

• K⁺, Ar , Cl^–

• C^l–, K⁺, Ar

• Ar, Cl^–, K⁺

Tags

NGSS.HS-PS1-1

What increases in equal steps of one from left to right in the periodic table for the elements lithium to neon?

• the number of occupied electron energy levels

• the number of neutrons in the most common isotope

• the number of electrons in the atom

• the atomic mass

Tags

NGSS.HS-PS1-1

Which property decreases down group 17 in the periodic table?

• atomic radius

• electronegativity

• ionic radius

• melting point