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Chapter 3
Question | Answer |
---|---|
chemistry is the study of | composition, structure properties of matter |
gamma rays are | electromagnetic waves |
which of the folowing processes always decreases the number of protons by a even number | alpha decay |
who called the atom a atom | Democritus |
a nuclied is identified by | the number of protons and neturons in its nucleous |
an atom of potassium has 19 protons and 20 neutrons, what is its mass number | 39 |
the discovery of electrons resulted from experiments using | cathode rays |
which instrument detect radiation by counting electric pulses carried by ionized gas atoms | geiger-muller counters |
who discovered the nucleous by bombarding gold foil with positively charged particles | rutheford |
in a glass tube electrical current passes from the negativeelectrodde called the to the other electrode | cathode |