Periodic Table Trends

What happens to the number of valence electrons as you move from group 1 to group 18 on the periodic table?

• Decrease

• Stays the Same

• Decrease then Increase

• Increase

Determine which pair of elements from Column X are most likely to react with other elements on the Periodic Table. Choose from Column Y the reasons the element pairs you selected from the table above will not react.

• I. and VIII.

• II. and V.

• IV. and VI.

• IIl. and VII

Using the data from the table, which claim is correct?

• Sample 4 is a nonmetal

• Sample 2 is a metal

• Sample 1 is a metalloid

• Sample 3 is a gas

C-14 has the characteristics:

• 1,3,5,7

• 1,2,3,4

• 1,3,4,8

• 2,4,5,6,8

Which element is the least reactive?

• Al

• S

• Ar

• Cl

• P

Which statement below correctly describes what changes when moving downwards from fluorine to chlorine on the periodic table?

• The classification changes from non-metal to metal

• The number of total electrons remains constant

• The reactivity of the element decreases

• The number of valence electrons increases.

Which two elements have chemical and physical properties similar to those of (Ca)?

• H and Li

• Mg and Sr

• F and Cl

• Ne and Ar

Which statements correctly compare metals and nonmetals?

• Metals tend to be good conductors of thermal energy. 

  Nonmetals tend to be good insulators of thermal energy.

• Metals are dull and brittle. 

  Nonmetals are shiny and malleable.

• Metals are good insulators of electricity.

  Nonmetals tend to be good conductors of electricity.

• Metals cannot be stretched into thin wires.

  Nonmetals can be stretched into thin wires.

A Ca²⁺ ion differs from a Ca atom in that the Ca²⁺ ion has ___.

• more protons

• fewer protons

• more electrons

• fewer electrons

Compared to an atom of Sn, an atom of Sb contains____.

• One more proton

• One more neutron

• One less proton

• One less neutron