science module 3 Flashcards
what are atoms made up of?
protons, neutrons, electrons
how many elements are there?
118
Who was the first person to discover the atom?
Democritus in 485b.c.
Benjamin Franklin’s theory
positive and negative charges
John Dalton’s idea of an atom
a plain circle
J.J. Thompson’s idea of an atom
a pizza
ernest ruthford’s idea of an atom
the classic movie atom
Neil Bohr’s idea of an atom
the solar system
Erwin’s idea of an atom
a weird toxic blob
what are atoms?
the smallest piece of matter
what is the center of an atom?
the neclues
what is in the nucleus?
protons and neutrons
where is the electron in the atom?
electrons orbit around the nucleus, almost creating a shell
what is another word for the shell that electrons make around the nucleus?
the orbital
what makes up an individual atom?
the number of protons and neutrons
what is an atoms atomic number?
the number of protons and neutrons it has
what contributes to the charge of an atom?
the protons and electrons
how much larger are protons and neutrons than electrons?
2,000 times bigger
how much does 1 proton weigh?
1 AMU
How much does a neutron weigh?
1 AMU
what is the average atomic mass of 19.28
19
what is the average atomic mass of 18.97
19
how did Mendeleev arrange his periodic table?
by increasing atomic weights, and left open spaces for more elements in the future
What did the ancient Greek contribute?
the term “atom”
