Periodic Table of Elements Questions

The low ____________ of helium make blimps and weather balloons float.

Halogens combine with most metals to form __________, such as __________________.

Horizontal rows of elements on the periodic table are called ______________.

Which element is a brittle solid with low conductivity at STP?1) sulfur2) sodium3) argon4) aluminium

Vertical columns of elements on the periodic table are called __________ or ______________.

What are three compounds of carbon that are necessary for living things on Earth?

The number of ____________ in the outer energy level of an atom helps determine which category an element belongs in.

Most elements are are ______, which can be found to the left of the zigzag line on the periodic table.

Which lanthanide forms a compound that enables you to see red on a computer screen?

What are two products made from calcium compounds?

Which of the following characteristics does NOT describe transition metals?A. They are good conductors of thermal energy.B. They are more reactive than alkali and alkaline-earth metals.C. They have one or two electrons in the outer energy level.D. They are denser than elements in Groups 1 and 2.

The physical and chemical properties of the elements change __________.

Atoms of _____________ have two outer-level electrons.

For most elements, the _________ has one or two letters, with the first letter always capitalized.

Semiconductors, also called __________, are elements that border the zigzag line on the periodic table.

Metals that are less reactive than alkali metals and alkaline-earth metals are called_______________.

Which ion has the smallest radius?1) O2-2) S2-3) Se24) Te2-

What metal is flattened into sheets to make cans and foil?

The metalloids __________ and ______ both in Group 14, are used to make computer chips.

When the repeating chemical and physical properties of elements change periodically with the elements' atomic numbers, it is called the __________________.