Ch.17 physical science
Terms in this set (37)
What do atoms consist of?
protons, neutrons, electrons
What is an element?
pure substance that consists entirely of one type of atom
What is a chemical symbol?
The abbreviated name of an element
What is the smallest form of matter?
True or false atoms of different elements differ the number of protons they contain
True or Faulse: Protons and neutrons have different weight
False they have the same weight
In a neutral atom the outside has what charge
What is a proton?
positively charged particle found in the nucleus
What is a neutron?
a particle that has no charge and that is inside the nucleus
What is an electron?
a negatively charged subatomic particle
What is an electron cloud?
a region around the nucleus of an atom where electrons are likely to be found
Electrons are so small they...?
Have no weight
Atomic mass is the what of the Atom?
The weight of the atom
What contains most of the mass of the atoms
What is an atomic mass unit?
(Number at the bottom) the addition of protons and neutrons in nucleus
What is an atomic number?
the number of protons in an atom
What charge are atoms?
What is an isotope?
Atoms of the same element that have different numbers of neutrons
What is the periodic table?
an arrangement of elements in columns, based on a set of properties that repeat from row to row
What are energy levels?
distance of electron from the nucleus
These energy levels make up what?
An electron cloud
the closer to the nucleus the...
The further from the nucleus...
If you have the same number of electrons in the outer circle they...
Have similar traits
first energy level
holds 2 electrons (closest to nucleus)
second energy level
holds 8 electrons
third energy level
holds 18 electrons
Fourth energy level
holds 32 electrons (furthest from nucleus)
How many energy levels are there?
groups on periodic table
a vertical row of elements in the periodic table
periods on periodic table
A horizontal row of elements in the periodic table
What's our metals?
Elements that have common properties
What are nonmetals?
elements that are poor conductors of heat and electricity
What are metalloids?
elements that have some properties like metals and some like nonmetals
What are the transition elements?
They are the D-block elements and are located in Groups 3 through 12.
how to find atomic mass
protons + neutrons
How to find the amount of neutrons
Subtract: Mass Number - Protons
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