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science ch9 lesson 2


atom the smallest particle of an element that still has the same chemical properties of the element
nucleus at the center of an atom and contains most of its mass
neutrons have no electrical charge
protons have a positive electrical charge
atomic number the number of protons in an atom element
electrons have a very small mass and a negative electrical charge
periodic table a chart that shows the elements in order of increasing atomic number
motecule the smallest particle of a compound that still has all the qualities of that compound
isotopes atoms of the same element that have different atomic massses
Na+CI = ? NaCI
chemical formula a simple way to indicate the composition of elements in a compound
metals conduct heat and electricity. it melts at high temperatures and can be reshaped
nonmetals have a dull surface and melt at lower temperatures, and tend to break when bent
metalloids have some properties of metals and some of nonmetals
atomic mass the number of protons added to the number of neutron
which of the following has the LEAST atomic mass? A) oxygen)O) B)carbon(C) C)nitrogen(N) D)helium(He) B: Carbon(C)
the lead in a pencil is composed of the element_________ carbon
water is composed of the elements _________ and _________ hydrogen; oxygen
compound a substance formed from the chemical combination of 2 or more elements that then act as a unique substance
water is a ______ compound
scientists have discovered more than ____ elements 100
a diamond is made of what? carbon
isotopes atoms of the same element may have different numbers of neutrons
iron an atom that has an overoll positive or negative charge
chemical formula a simple way to indicate the composition of elements in a compound
Created by: moncheechee19