The number of in the atom is what determines whether the atom is a potassium atom, a hydrogen atom, or an oxygen atom.

proton
neutron
electron
quark

The correct answer is proton.

Explanation:

Atom is a smallest unit of the matter. It consists of proton, neutron and electrons. They are the subatomic particle of the atom.

Electron is negatively charged particle. Proton is a positively charged particle.

Neutron has no charge.

Atomic number of the atom is equal to the number of protons present in the nucleus of the atom. It identifies the chemical element.

In an atom having no charge, the atomic number is equal to the number of electrons.

If the atom is negatively or positively charged, then the number of electrons will vary.

Therefore, The number of proton in the atom is what determines whether the atom is a potassium atom, a hydrogen atom, or an oxygen atom.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

3. dark matter

empty space could also be a simple vacuum