The correct setoff quantum numbers for the unpaired electron of scandium (Z = 21) is:
  • 3, 2, 3, ±1/2
  • 4, 2, 2, ±1/2
  • 3, 2, -2, ±1/2
  • 3, 1, 1, ±1/2
Which of the following elements does not exhibit the electrovalencey?
  • Chlorine
  • Calcium
  • Carbon
  • Sodium
While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation?
  • Dust particles are present in air
  • Carbon dioxide is present in air
  • Air is a poor conductor of electricity under normal conditions
  • One of the above
How many electrons in a Hydrogen (H) atom:
  • one
  • two
  • four
  • three
The charge on an electron is equal to:
  • 1. 6 × 10C of -ve charge
  • 2. 6 × 10C of -ve charge
  • (i) and (ii)
  • None of the above
How many protons does this element have?
  • 40
  • 21
  • 20
  • 41
The yellow atoms are called
  • metals
  • nonmetals
  • metalloids
  • noble gases
The number of protons is equal to
  • Atomic number
  • Number of neutrons
  • Energy levels
  • The periodic table groups
How many protons does Calcium have?
  • 40
  • 21
  • 20
  • 41
How many electrons does iron have?
  • 56
  • 26
  • 30
  • 82
Name the pictured element.
  • Nitrogen
  • Nickel
  • Sodium
  • Neon
What is the number of protons that the element in this image contain?
  • 18
  • 14
  • 15
  • 7
What is the atomic mass of the pictured isotope?
  • 17
  • 18
  • 35
  • 36
What model of an atom is shown in the diagram?
  • nuclear
  • Dalton
  • gamma
  • plum pudding
Most of the mass in an atom is made up of _____________________?
  • protons and electrons
  • protons and neutrons
  • neutrons and electrons
  • electrons and quarks
What is fired at the gold foil in this experiment?
  • beta particles
  • alpha particles
  • gamma rays
  • protons
Different isotopes have different _____________.
  • Different masses
  • Different electrons
  • Different atomic numbers
  • Different protons
How many different types of atoms are elements made from?
  • 1
  • 2
  • 3
  • 4
How many neutrons does a Carbon 13 atom have?
  • 5
  • 6
  • 7
  • 8
The atomic number of an element tells you
  • how many protons and neutrons it has
  • the mass of the nucleus
  • how many isotopes it has
  • how many protons it has
Uranium-238 decays into Thorium-234 by emitting
  • a neutron
  • an alpha particle
  • a beta particle
  • a gamma particle
What is an atom mostly made up of?
  • empty space
  • electrons
  • protons
  • alpha particles
Up to how many electrons are on the shells after the first shell?
  • 8
  • 6
  • 4
  • 2
What part of the atom has no charge?
  • proton
  • atom
  • electron
  • neutron
In a correctly written symbol what would be located in the "Z" position?
  • number of neutrons
  • number of electrons
  • atomic mass
  • atomic number
How many neutrons does iron have?
  • 56
  • 30
  • 26
  • 82
What orbits the nucleus?
  • proton
  • nucleus
  • electron
  • neutron
What part of the atom has a mass of nearly 0?
  • proton
  • atom
  • electron
  • neutron
Name the scientist who carried out the "gold foil experiment".
  • Thompson
  • Bohr
  • Rutherford
  • Dalton
The atomic number of potassium is 19. Therefore, the Potassium atom has:
  • 19 protons, 39 neutrons, 19 electrons
  • 39 protons, 19 neutrons, 26 electrons
  • 19 protons, 20 neutrons, 19 electrons
0 h : 0 m : 1 s

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