science
what is a scanning microscope used to see
Atoms
Democritus and Dalton
Elements
what did James chadwick disover?
Neurtons
What is the only bird that can fly backward?
A hummingbird
Isotopes are what
atoms
Mass number
a neutral atom would become an ion that has a charge of 2+ by what?
losing two electrons
A carbons average atomic mass is 12.01 because why?
Carbon -12 is the most common isotope
What animal lives in a shell and moves very slowly?
A snail
what does adding the number of protons and neutons in an atom result in?
Atomic mass
what are atoms of the same element that have different numbers of neutrons?
Isotopes
what are formed when atoms gain or lose electrons?
Ions
an elements (what) is the same as the number of protons in the nucleus of its atoms?
Atomic number
What is the largest planet in our solar system?
Jupiter
what was J.J. Thomson conclusion abou the mass and charge of electrons based upon the results of his experiments?
Electrons have a negative charge and small mass. It is constant.
They both are in the nucleus of atoms
What is an atom?
The main part of matter. It has a nucleus and protons. Neutral neutrons.
compare the size of an atom to the size of the typed period at the end of a sentence.
An atom is a lot smaller. There are trillions of atoms in the period at the end of a sentence.
What city is known as "The Big Apple"?
New York City
what is one way that modern atomic model differs from the Bohr model of the atom.
Bohr - orbit is fixeds and predictable.
Modern atomic model - orbit unknown probablility.
Define radioactive
Unstable material because there are too many nuclear energy.
what is one way that people use radioactivity?
PET scan
This marine mammal is known for its playful behavior and balancing a ball on its nose.
What is a seal
This flightless bird is native to Antarctica.
What is a penguin