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Atoms and Elements
Question | Answer |
---|---|
How are atoms and elements related? | an atom is the smallest particle that can still be considered an element |
what are the 3 particles that exist in atoms? what are their charges and where are they found? | neutrons- no charge- nucleus protons- positive- nucleus electrons- negative- electron cloud |
what is an element? | a substance that cant be broken down into any other substances by physical or chemical means |
what determines an elements chemistry? | # of valence electrons in each atom determines the chemical properties of that element |
what are valence electrons? | electrons with highest energy, outer most shell |
what is a chemical bond? | force of attraction that holds atoms together as a result of rearrangement of electrons between them |
what does the atomic number of an element tell you? | number of protons in each atom of that element |
how do you find out how many neutrons an atom of an element has? | subtract the atomic mass and the atomic number |
whats the chemical symbol for Krypton? | Kr |
how many protons does Radium have? | 88 |
when atoms lose electrons they? | become positively charged |
in what bond does atoms exchange electrons? | ionic |
in ionic bonds, what goes first in the chemical formula name? | cation |
in the chemical formula Na2S, what does the number 2 represent? | 2 sodium atoms |
what is a covalent bond? | bonds where electrons are shared between atoms |
what is a polyatomic ion? | ions that are made of more than one atom? |
what is an independent variable? | one factor that is purposely changed to test a hypothesis |
what is a dependent variable? | the factor that may change in response to the independent variable |