CHEM 101-102

All elements on the modern Periodic Table are arranged in order of increasing

• Atomic mass

• Number of protons per atom

• Number of neutrons per atom

• Molar mass

Which electron shell contains the valence electrons of a strontium atom in the ground state?

• The fifth shell

• The second shell

• The sixth shell

• The eighteenth shell

Chlorine and element X have similar chemical properties. An atom of element X could have an electron configuration of

• 2-8-8

• 2-2

• 2-8-18-7

• 2-8-1

The elements in Period 4 on the Periodic Table are arranged in order of increasing

• Atomic number

• Number of valence electrons

• Atomic radius

• Number of occupied shells of electrons

• Different molecular structures and the same properties

• Different molecular structures and different properties

• The same molecular structure and the same properties

• The same molecular structure and different properties

Which elements have the most similar chemical properties?

• Boron and carbon

• Argon and silicon

• Aluminum and bromine

• Oxygen and sulfur

Which group of elements contains a metalloid?

• Group 16

• Group 2

• Group 8

• Group 18

At STP, which element is malleable and a. Good conductor of electricity?

• Xenon

• Silicon

• Platinum

• Hydrogen

At STP, which substance is a noble gas?

• Ammonia

• Chlorine

• Neon

• Nitrogen

Which group on the Periodic Table has at least one element in each of the three phases of matter at STP?

• 1

• 18

• 2

• 17