They are called Electrons.
B. Neutron has no charge
Firstly, the nucleus is what contains the protons and electrons, so it is not an atomic particle. The electron has a negative charge, and the proton has a positive charge (you can remember this by looking at its prefix 'pro'). This means the neutron has no charge (think of it as neutral).
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The number of electrons, in turn, determines the chemical properties of the atom. Protons contribute to the mass of an atom and provide the positive charge to the nucleus. The number of protons also determines the identity of the element
It is A(electron)
The electron is located in energy levels around the nucleus. Protons and neutrons are tightly held together in the nucleus
Question 1: (A)
The number of electrons determine the chemical properties of an atom.
Question 2: (C)
Test tube cannot measure the volume of liquids rather they are used in chemical reactions
Question 3: (D)
Pauli's Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers.
sodium is solid at rt