Which of the following does not describe Mendeleev’s Periodic Table?
a. It consists of vertical columns and horizontal rows.
b. The elements are arranged in order of increasing atomic number.
c. The elements with similar properties are placed in the same vertical column.
d. There are blank spaces reserved for undiscovered elements.

Which is not true about the Modern periodic Table?
a. It consists of horizontal rows and vertical columns.
b. It contains basic information about elements.
c. The elements are arranged in order of increasing atomic number.
d. The elements are arranged in order of increasing mass.

Elements that are found in the same group have similar _______.
a. atomic mass
b. atomic number
c. atomic properties
d. atomic size

What describes the arrangement of electrons outside the nucleus of an atom?
a. Electron affinity
b. Electron cloud
c. Electron configuration
d. Electronegativity

Which of the following sets of elements are all metals?
a. Ba, O, Cl, Au
b. K, Cu, Hg, Li
c. Mg, S, P, C
d. Na, Ca, N, Fe

What is common to the electron configuration of elements found in the same period?
a. number of electrons
b. number of energy levels occupied
c. number of sublevels
d. number of valence electrons

Which of the following elements is not a noble gas?
a. Argon
b. Helium
c. Neon
d. Oxygen