Physical science help ( fast) ( 4 $ only)

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. There’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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