atoms Flashcards
Do the melting and boiling points of the halogens increase or decrease as you go down the group?
increase
what is a mixture?
a mixture that contains 2 or more substances not chemically bonded together
What are isotopes?
Atoms of the same element with different numbers of neutrons
name two properties of the Group 1 metals:
reactive, soft
Is carbon dioxide (CO2) a molecule, a compound, or both?
both
An atom of oxygen has 6 electrons in the outer shell. In a reaction, it gains 2 electrons.
2-
A compound is a _____ made from ___ or more different _____ that are chemically ____ together.
substance, two, elements, bonded
name three properties of metals:
- Good conductors of heat
- Sonorous (produce a ringing sound when struck)
- malleable
The atoms of elements in the same period have the same number of:
shells
Alkali metals react with water. Which two products are formed?
- metal hydroxide
- hydrogen
how do you calculate the relative atomic mass of copper to 1 decimal place.
sum of (isotope abundance x isotope mass)
DIVIDED BY
sum of abundance of all isotopes
Which sub-atomic particle does NOT have a charge?
neutron
What do we call an atom that has a positive or negative charge?
an ion
