8th grade Science Atoms and Periodic Table Test-Modified

Name: ______Date: ______

Multiple Choice: Circle the letter of the correct answer

  1. A British scientist named J J Thompson discovered the electron in 1897. He suggested that the atom was a solid central sphere, with electrons in a mass, or cloud, of positive charge (cookie dough model). How was the Thomson model different from the Bohr model that followed it?
  2. The Bohr model did not include positive charges in the atom
  3. The Bohr model showed electrons surrounding the positive nucleus
  4. The Bohr model showed neutrons in a cloud surrounding the negative nucleus.
  1. An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
  2. 85
  3. 25
  4. 210
  1. The current model of the atom shows electrons in a cloud surrounding the nucleus. How does the electron cloud model differ from the Bohr model?
  2. The electron cloud shows there is not empty space in an atom
  3. The electron cloud shows that electrons do not have a negative charge
  4. The electron cloud shows a region in which electrons are likely to be found
  1. Marcus wants to use two objects to compare the sizes of a proton and an electron. If he uses a basketball for a proton, which object would best represent an electron?
  2. A pea
  3. A beach ball
  4. A soccer ball
  1. The periodic table has a lot of information in the form of letters and numbers. The information is organized into boxes, which are placed in rows and stacked in columns. Which of the following does each box represent?
  2. A group
  3. A period
  4. An element
  1. Which describes how elements are arranged in the periodic table?
  2. By chemical symbol
  3. By increasing atomic mass
  4. By increasing atomic number
  1. What is true about the position of all metals in the periodic table?
  2. They are in the bottom period
  3. They are in the rightmost column
  4. They are to the left of the zigzag line
  1. On the periodic table, find the element with the average atomic mass of 87.62 Which of the following is the chemical symbol for this element?
  2. Rb
  3. Sc
  4. Sr
  1. The periodic table is arranged in columns and rows. What are the columns and the rows of the periodic table called?
  2. Periods and energy levels
  3. Groups and periods
  4. Atomic numbers and periods
  1. Sodium (Na) is in Group 1 of the periodic table. Sodium atoms readily form bonds with other atoms. Which statement best explains this property?
  2. Sodium boils at a higher temperature than water
  3. Sodium atoms have an unequal number of protons and neutrons
  4. Sodium atoms need to give up only one electron to become stable
  1. You have been asked to draw a Bohr model of the element carbon. How would you arrange the dots that represent electrons?
  2. They would be in rings around the nucleus
  3. They would be located in a central nucleus
  4. They would be spread evenly in the shape of a cloud.
  1. Which of the following is least likely to form chemical bonds with other atoms?
  2. A hydrogen atom containing 1 valence electron
  3. A neon atom containing 8 valence electrons
  4. A sodium atom containing 1 valence electron
  1. In a neutral atom, the number of electrons equals the number of what other part?
  2. Protons
  3. Neutrons
  4. Nuclei
  1. Nitrogen is an element. What is the smallest particle of nitrogen that has all the properties of nitrogen?
  2. An atom of nitrogen
  3. A proton from a nitrogen atom
  4. An electron from a nitrogen atom
  1. What is a column of the periodic table called?
  2. A group
  3. A period
  4. An energy level
  1. Which pair of elements are in the same group?
  2. Rb and Cs
  3. Ca and Ti
  4. Li and Be
  1. Which properties most likely belong to a metal?
  2. Brittle and dull
  3. Liquid and clear
  4. Ductile and malleable
  1. Which of the following explains why elements in group 18 do not readily form compounds?
  2. These elements are very reactive
  3. These elements have a full outermost energy level
  4. These elements are within the same period
  1. An atom of lead has the atomic number 82 and a mass number of 207. How many neutrons does this atom of lead have?
  2. 82
  3. 125
  4. 207
  1. Which of the following is not made up of atoms?
  2. Atoms
  3. Molecules
  4. Subatomic particles
  1. Each atom of silicon (Si) has 4 valence electrons. Which of these elements also has 4 valence electrons?
  2. Lead (Pb)
  3. Nitrogen (N)
  4. Aluminum (Al)
  1. What is the mass number of an atom that has 4 protons, 4 electrons and 5 neutrons?
  2. 4
  3. 5
  4. 9
  1. Atoms are the building blocks of all matter. Which of the following are the building blocks of atoms?
  2. Elements
  3. Molecules
  4. Subatomic particles
  1. The positively charged center of the atom is called the
  2. Element
  3. Neutron
  4. Nucleus
  1. What kind of chemical bond is formed when electrons are transferred from atom to atom?
  2. Ionic
  3. Covalent
  4. Magnetic
  1. A chemical bond that occurs when atoms share electrons is a(n) ______bond
  2. Ionic
  3. Covalent
  4. Metal
  1. Which of the following is an atom that has GAINED an electron?
  2. Negative ion
  3. Positive ion
  4. Polar molecule
  1. Na and Cl are chemical
  2. Symbols
  3. Formulas
  4. Names
  1. How many valence electrons does a Group 16 element have?
  2. 6
  3. 16
  4. 2
  1. How many valence electrons does a Group 8 element have?
  2. 6
  3. 8
  4. Unknown
  1. Which of the following elements would you expect to best conduct heat and electricity?
  2. Hydrogen
  3. Sodium
  4. Copper
  1. The periodic table can be divided into three basic categories. Which of the following is not one of the three major categories used on the periodic table?
  2. Metals
  3. Alloys
  4. Metalloids