Unit 1/Module 5: Elements and Compounds Flashcards
“A” or top number next to element?
The number of protons and neutrons
“A” or the bottom number next to element?
The number of protons only
What happens when an atom does not have equal number of protons and electrons?
It becomes an ion
What is a positively charged ion?
Cation
What is a negatively charged ion?
Anion
What is the formula for average atomic mass?
Abundance/100 * amu
What are the 7 diatomic elements?
O, N, F, H, Cl, Br, I
What are columns called?
Groups or families
What are rows called?
Periods
What are characteristics of metals?
Conduct electricity and heat, solid at RT.
What metal is not solid at RT?
Mercury(liquid)
What are properties of nonmetals?
Poor conductors of electricity and heat, brittle, gas at RT.
Which nonmetal is not gas at RT?
Bromine(liquid)
What is empirical formula?
The smallest whole number ratio of the elements
What is the difference between molecular and ionic compounds?
Molecular compounds are generally covalent bonds.
