honors chem unit 1

what are the 3 main states of matter?

who created the first recognized model of the atom, attributed symbols to elements, and theorized about compounds?

most of the mass of the atom is found in the what?

particles in a solid state are not closely packed and are irregular in their arrangement

isotopes can be separated by which processes

molecules that contain different types of atoms are called what?

losing electrons causes and atom to be positively charged

the initial isotope is called the ... isotope; the resulting isotope is called the ...

the number of electrons in each isotope is the same

a measure of the amount of kinetic energy possesed by a substance is known as ...

electrons were first called corpuscles

The current accepted model was proposed by Schrodinger in which year?

all molecules are compounds, but not all compounds are molecules

what determines the way an element behaves?

interaction between cosmic rays and energetic nuclei in the upper-most atmospheric layers can lead to what?

there are 85 stable elements on the periodic table. how many isotopes do they have?

the first atom was first hypothesized by which Greek philosophers?

most of Bohr's research & conclusions were around

Which of the following did Rutherford do?

Dalton knew isotopes existed.

atoms have an overall net charge of what?

which of the following is a compound?

an atom can be defined as the smallest particle of a given ... that retains the element's chemical properties

an atom that has the same number of protons, but a different number of neutrons is called what?

the plum pudding model was the first atomic model to show what?

the change directly from a solid into a gas

which of the following is a molecule?

The nucleus is surrounded by a cloud of electrons at varying energy levels.

what is a collection of 2+ atoms of the same or different element in a definite arrangement called?

elements on the periodic table have ... occuring isotopes

changes in state involve what being supplied to or removed from the substance

losing some or all of an atoms electrons, leaving a positively charged nucleus is

Thomson's plum pudding model was in 1904

Thomson used what in his experiments?

the nucleus is held together by what?

matter is made up of particles which are in constant, random motion

Chadwick added on to Schrodinger's model with his discovery in 1932. What did he discover?

... are the simplest building block of matter

isotopes that are unstable are what?

a change in the number of protons in the nucleus causes the atom to change in what?

Bohr was a physicist who used quantum theory to explain arrangement of electrons. What did he discover?