physical science help fast 4 only 2

A researcher is using a particle accelerator in an experiment studying isotopes. How can the researcher change one isotope into a different isotope of the same element?

by removing valence electrons

by adding valence electrons

by adding or removing protons

by adding or removing neutrons

Sonya reads the element riddle below.

I am shiny. I form +1 ions. Thereâ€™s more!
I am the most reactive metal in Period 4.
Who am I?

Which element is the answer to the riddle?

krypton

potassium

sodium

bromine

hich describes a value for density?

a value for volume, such as m3, divided by a value for mass, such as kg

a value for mass, such as kg, divided by a value for volume, such as m3

a value for distance, such as m, divided by a value for time, such as s

a value for time, such as s, divided by a value for distance, such as m

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physical science help fast 4 only 2

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