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Science Quiz Unit 2

QuestionAnswer
what is a "period" on a periodic table? a row- elements have the same energy levels
what is the periodic table? a chart that organizes the elements by their properties.
what is an element? matter to have only one kind of atom.
3 things in niels bohr modern atomic theory -electrons are arranged by energy level. -lower energy levels closest to nucleus. higher E-farther -electrons move in spherical cloud around nucleus (varying density)
two ways to show atom info? - atomic mass -element symbol
what is and ion? atoms of the same element and different number of electrons.
what mass is listed on the periodic table? average of all the atom's masses (isotopes) -listed as a decimal -unit= atomic mass unit
what is an isotope? atoms of the same element with dif number of neutrons.
relationship between protons and electrons they r equal
what is the atomic mass of an element? number of protons + number of neutrons.
what is the atomic number of an element? the number of protons -every element has a specific number of protons
what is a group on the periodic table a column- elements have similar properties and form similar bonds.
parts and charges of an atom? proton- positive- in nucleus neutron- neutral charge - in nucleus electron- negative charge- around nucleus.
2 things rutherford discovered? -the atoms are mostly empty space (electron cloud) -nucleus- positively charged center.
who discovered electrons? Thompson
what is matter? anything that has mass and takes up space (ex. water)
who determined atoms were to small to be seen for the human eye? Dalton
who developed the law of conservation of matter? (that matter can be created or destroyed) Lavoisier
who introduced the idea of atoms and how they make up matter? Democritus
What is an atom? the smalllest particle that takes up most types of matter.
Created by: sophialabate
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