How do scientists determine the number of neutrons in an isotope of an atom?
a.
they find the number of protons.
b.
they divide the atomic mass by two.
c.
they add the number of electrons and protons.
d.
they subtract the atomic number from the atomic mass.

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete