Review Chemistry Midterm Exam

Energy required to remove an electron from an atom is called

• electronegativity
• ionization energy
• atomic radius

Which type of element characterized by the presence of electrons in the d orbital?

• non-metal
• metal
• transition metal

Which type of element that is a good conductor of heat and electric current?

• non-metal
• metal
• neither
• both

Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?

• Atoms contain tiny, negatively charged electrons.
• Atoms are always in motion.
• Atoms contain a tiny, positively charged nucleus.
• Atoms that combine do so in simple whole-number ratios.

An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.

• 152 protons and 76 electrons
• 76 protons and 0 electrons
• 38 protons and 38 electrons
• 76 protons and 76 electrons

The sum of the protons and neutrons in an atom equals the ____.

• atomic number
• nucleus number
• atomic mass
• mass number

What does the number 84 in the name krypton-84 represent?

• the atomic number
• the mass number
• the sum of the protons and electrons
• twice the number of protons

In which of the following sets is the symbol of the element, the number of protons, and the number of electrons given correctly?

• In, 49 protons, 49 electrons
• Zn, 30 protons, 60 electrons
• Cs, 55 protons, 132.9 electrons
• F, 19 protons, 19 electrons

Using the periodic table, determine the number of neutrons in Oxygen.

• 4
• 8
• 16
• 24

How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?

• 50 protons, 50 electrons, 75 neutrons
• 75 electrons, 50 protons, 50 neutrons
• 120 neutrons, 50 protons, 75 electrons
• 70 neutrons, 75 protons, 50 electrons