The Periodic Table questions

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The Periodic Table question collection

Review The Periodic Table questions for Chemistry, with correct answers shown and coverage across defining the smallest part of an element that can still be that element; defining a substance made of only one type of atom called; choosing which formula represents a compound.

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Question 1

What is the smallest part of an element that can still be that element?
  1. An atom
  2. A molecule
  3. A compound
  4. A mixture

Question 2

What is a substance made of only one type of atom called?
  1. An element
  2. A compound
  3. A mixture
  4. An isotope pair

Question 3

Which formula represents a compound?
  1. CO2
  2. O2
  3. N2
  4. Ar

Question 4

Where are electrons found in an atom?
  1. In shells around the nucleus
  2. Inside the nucleus with protons
  3. In the outermost layer of all atoms
  4. Mixed with neutrons in the centre

Question 5

Which subatomic particle has a positive charge?
  1. Proton
  2. Electron
  3. Neutron
  4. Isotope

Question 6

Which subatomic particle has no charge?
  1. Neutron
  2. Proton
  3. Electron
  4. Nucleus

Question 7

In a neutral atom, the number of protons equals the number of which particle?
  1. Electrons
  2. Neutrons
  3. Shells
  4. Isotopes

Question 8

What does atomic number tell you?
  1. The number of protons
  2. The number of neutrons
  3. The total number of particles in the nucleus
  4. The number of electron shells

Question 9

Which symbol represents potassium?
  1. K
  2. P
  3. Po
  4. Pt

Question 10

How did Dalton's simple model represent atoms?
  1. As tiny solid spheres
  2. As positive spheres containing electrons
  3. As nuclei orbited by electrons
  4. As nuclei with electrons in shells

Question 11

The periodic table is arranged in order of increasing?
  1. Atomic number
  2. Mass number
  3. Number of isotopes
  4. Reactivity

Question 12

What are vertical columns in the periodic table called?
  1. Groups
  2. Periods
  3. Blocks
  4. Shells

Question 13

What are horizontal rows in the periodic table called?
  1. Periods
  2. Groups
  3. Blocks
  4. Shells

Question 14

Why do elements in the same group have similar chemical properties?
  1. They have the same number of outer-shell electrons
  2. They have the same number of neutrons
  3. They have the same total number of protons
  4. They have the same number of electron shells

Question 15

Why are Group 0 elements usually unreactive?
  1. They have full outer shells
  2. They have one outer electron
  3. They have seven outer electrons
  4. Their proton and electron numbers match

Question 16

Most metals are found on which side of the periodic table?
  1. Left-hand side
  2. Right-hand side
  3. In the middle row
  4. In Group 0

Question 17

What did Mendeleev use periodic-table gaps to predict?
  1. Properties of undiscovered elements
  2. Proton numbers of known elements
  3. Isotope counts for each element
  4. Electron arrangements of each element

Question 18

Why can scientists replace an atomic model?
  1. New evidence does not fit the old model
  2. A new model is easier to draw
  3. Most scientists vote for a change
  4. The old model reaches a fixed age

Question 19

What is fixed in every sample of a pure compound?
  1. The ratio of its elements
  2. The sample's mass
  3. The physical state
  4. The number of particles

Question 20

Which pair correctly matches symbol and element?
  1. Na - sodium
  2. S - silicon
  3. Cl - calcium
  4. Mg - manganese

Question 21

Which charge does an electron have?
  1. Negative
  2. Positive
  3. Neutral
  4. Variable

Question 22

Which property of an element equals its period number?
  1. Occupied electron shells
  2. Outer electrons
  3. Protons
  4. Neutrons

Question 23

What is a compound?
  1. A substance containing chemically bonded elements
  2. A mixture of substances not chemically bonded
  3. A substance made from one element
  4. Two elements placed together without reacting

Question 24

What is a mixture?
  1. Substances not chemically bonded
  2. Elements chemically bonded
  3. One atom type only
  4. Ions in a fixed ratio

Question 25

Which change forms a positive ion from an atom?
  1. Electron loss
  2. Electron gain
  3. Proton loss
  4. Neutron gain

Question 26

Which particles have similar relative masses?
  1. Protons and neutrons
  2. Protons and electrons
  3. Neutrons and electrons
  4. Electrons and photons

Question 27

Where are protons and neutrons found?
  1. In the nucleus
  2. In electron shells
  3. Outside the atom
  4. In a chemical bond

Question 28

Which change forms a negative ion from an atom?
  1. Electron gain
  2. Electron loss
  3. Proton gain
  4. Neutron loss

Question 29

Which formula represents a molecule of an element?
  1. O2
  2. CO2
  3. H2O
  4. NaCl

Question 30

What does a chemical symbol represent?
  1. An element
  2. A mixture
  3. A complete reaction
  4. A state of matter

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Review The Periodic Table questions for Chemistry, with correct answers shown and coverage across defining the smallest part of an element that can still be that element; defining a substance made of only one type of atom called; choosing which formula represents a compound.

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