1 Flashcards
(10 cards)
What are the three subatomic particles in an atom?
Protons, neutrons, and electrons.
What is the approximate radius of an atom?
About 0.1 nanometers (1 × 10⁻¹⁰ m).
Where is the nucleus located in the atom?
In the middle of the atom.
What does the nucleus contain?
Protons and neutrons.
What is the charge of the nucleus
It has a positive charge due to the protons.
Where is almost all of the atom’s mass concentrated?
In the nucleus.
What are the relative charges of protons, neutrons, and electrons?
Proton: +1
Neutron: 0
Electron: –1
What are the relative masses of protons, neutrons, and electrons?
Proton: 1
Neutron: 1
Electron: Very small (often taken as 0)
Where are electrons found in an atom?
In electron shells that move around the nucleus.
What is the charge and size of electrons?
Negatively charged and tiny.
