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7th grade Chemistry

Terms in this set (19)

atomic number
Periodic law states that properties of elements are periodic functions of their.......
Name of element, symbol, atomic number and mass
What info do you find in an element display on the periodic table?
Families
Vertical columns of elements in the periodic table
Poor
Nonmetals are usually ____________________conductors of electricity
Democritus
Who discovered atoms 2000 years ago?
Mendeleev
Who was first to develop the periodic table by atomic mass?
Henry Moseley
Who further developed the periodic table by atomic number and died at 27?
Proton (+), Neutron (neutral), Electron (-)
Name three subatomic particles and their electric charge(s).
Electron
Which subatomic particle weighs the least?
Highly active metal
Each period of the element table begins on the left with a _____________________.
Inert
Brittle element that is not a good conductor of heat and electricity.
Gain
Nonmetals tend to ___________________ electrons when forming compounds.
Periodic Law
Chemical and physical properties of the elements are periodic functions of their number.
Periods
Horizontal rows on element tables are called.........
Weak force, strong force, electromagnetic force, and gravity (the strongest)
Name the 4 forces that account for behavior of subatomic particles.
Neutrons and Protons
Which subatomic particles weigh 1 amu?
Wave mechanics.
Modern atomic model is based on ...............
Atoms believed to exist, built on Democritus theory that atoms are indivisible and indestructible, atoms of same elements are the same, atoms of different elements are different. Atoms join to make compounds.
Describe the Dalton model
Discovered electrons (corpuscle), negatively charged particle and hypothesized that a positively charged particle existed.
Describe Thompson's plum pudding model
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