Elements are placed in the same column of the periodic table because they share the same number of valance electrons.

a. True

b. False

In what year did french chemist antoine lavoisier group the known elements into categories he called metals, nonmetals, gases, and earths?

If enough heat is added to a container of water, what will happen to it?

Under which conditions does a sample of the same mass of carbon dioxide have the lowest entropy value? A. Solid at high temperature B. Solid at low temperature C. Gas at high temperature D. Gas at low temperature

Which of the following animal niches will be filled as in ecosystem Begins the stage of ecological succession

Identify some acids that are found in everyday materials. Lemon juice baking soda dish detergent vinegar hand soap

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin

How many vowels does the word love have

What is silicon used for? -matches -gunpowder -glass -steel can coating