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Atoms Review
Review of subatomic particles and elements
Question | Answer |
---|---|
smallest part of element (basic unit) | atom |
subatomic particle with a negative charge | electron |
overall charge of an atom | zero (neutral) |
subatomic particle with a positive charge | proton |
substance that can't be broken down by chemical means; usually has a 1 or 2 letter symbol | element |
charge of the nucleus | positive |
subatomic particle with no charge | neutron |
this is where you find electrons | electron cloud |
this is where you find protons and neutrons | nucleus |
subatomic particle that contributes to the atom's volume and reactivity | electrons |
subatomic particles that contribute to the atom's mass | protons & neutrons |
the number of protons only (identifies the element) | atomic number |
the sum (or total) of protons & neutrons | atomic mass |
change in number of electrons | ion |
change in the number of protons | a different element |
change in the number of neutrons | isotope |
elements on the current periodic table are arranged this way | increasing atomic number |
can be hammered without breaking | malleable |
can be made into wires | ductile |
are usually solids, shiny and GOOD conductors of heat and electricity | metals |
are usually gases, dull and POOR conductors of heat and electricity | nonmetals |
they have properties of metals and nonmetals and are SEMI conductors | metalloids |
it breaks or shatters when hammered | brittle |
vertical columns on the periodic table (18) | group/family |
he created the first periodic table | Dmitri Mendeleev |
horizontal rows on the periodic table (7) | period |
Name of Group 1 elements | Alkali Metals |
Name of Group 17 elements | Halogens |
Name of Group 2 elements | Alkali Earth Metals |
Name of Group 18 elements | Noble Gases |
this is how elements on the old periodic table were arranged | increasing atomic mass |
the smallest unit of a substance that keeps its chemical properties (usually a formula) | molecule |
subatomic particle that identifies the element | protons |
subatomic particles that must be in the same amount so atom can have zero charge (neutral) | protons & electrons |