Question
click below
click below
Question
Normal Size Small Size show me how
Physics atoms
Question | Answer |
---|---|
the attraction between protons abd electrons can cause atoms to combine | Bonding |
electrical neutral | neutron |
second lightest element | helium |
atoms are much older than the material the compose. True or False? | true |
the most common type of molecule | H20 |
in 1827 he studied pollen grains under a microscope. who is he? | Robert brown |
smallest particle of a substance is a | molecule |
this man said matter was made of atoms. | John Dalton |
the evidence that atoms exist is called | Brownian motion |
the 5 elements that make up living things: | oxygen, carbon, hydrogen, nitrogen, calcium |
atoms of the same element having different numbers of neutrons are | isotopes |
the number of protons in the nucleus is called | the atomic number |
the toal number of nucleons in the nucleus of an atom | atomic mass unit |
electrons have______ | mass |
the arrangement in of _______ in the shells dictate the atom's physical and chemical properties | electrons |
central region of an atom | nucleus |
atoms move fastest in | gas |
like charges | repel |
building blocks of matter | an atom |
atoms are the smallest particles of an | element |
a substance made of only 1 kind of atom is a | element |
forms when electrons are transfered between atoms | Ionic bonds |
the lightest element is | hydrogen |
some atoms are old as | the universe |
a substance that is made of atoms of different elements in a fixed proportion is a/an | compound |
water and carbon dioxide are made of | molecules |
atoms are mostly empty space. true or false? | true |
the nucleus contains most of the ____ of an atom | mass |
forms when two atoms share electrons | covalent bonds |
electrons orbit the | nucleus |
unlike charges | attract |