1
What are the three basic components of an atom?
Protons, neutrons, and electrons
What electrical charge does a proton carry?
+1 (positive)
Which subatomic particle carries a negative charge?
Electron
Which subatomic particle has no electrical charge?
Neutron
Which subatomic particles are found in the nucleus?
Protons and neutrons
What does the Greek word “atomos” mean?
Uncuttable” or cannot be divided
What is found at the center or core of an atom?
Nucleus
If hydrogen has 1 proton, its atomic number is ?
1
What do we call the total number of protons and neutrons in an atom
Mass number
What is the smallest unit of an element
Proton
If an atom has 10 protons and a mass number of 18, how many neutrons does it have?
8 neutrons (18 − 10 = 8)
It is atoms that has same element that have the same number of protons but different numbers of neutrons
Isotope
Who discovered the neutron and when?
James Chadwick, 1932
Which subatomic particle has the least mass?
Electron
Where are electrons found?
Shells
Which experiment showed that atom have a nucleus?
Rutherford' gold foil experiment
Which part of the atom is involved in electricity?
Electrons
Why are atoms electrically neutral?
Balance or they have balanced charges
What term describes the outermost electron shell?
Valence shell
Why don’t electrons collapse into the nucleus?
Quantum or Energy-levels – quantum prevents collapse (concept implied by energy levels)