Chemistry Midterm Review #1

Which ions will combine to form sodium chloride?

The model shows an oxygen atom, which consists of 8 protons, 8 neutrons, and 8 electrons. Choose THREE statements that describe two electrons being added to the oxygen atom.

• The atom becomes more stable as all the electron shells are filled.

• There is a change in the chemical properties of the oxygen atom.

• There is an increase in the atomic number.

• A new element is formed.

• An oxygen ion (Oxide) is formed.

Four elements are shown. Use the periodic table to choose the most stable element.

• Carbon

• Sulfur

• Helium

• Chlorine

Which of the following is a halogen?

• neon

• scandium

• bromine

• arsenic

Which of the following pairs of atoms include a metal and a non-metal?

• A. K and O

• B. Be and Ag

• C. P and Cl

• D. Si and As

How can metals be distinguished from non-metals on the periodic table?

• All metals are located in the central regions of the periodic table or the d and f blocks.

• Metals are located to the right of the staircase and non-metals are found to the left.

• Metals and non-metals are randomly mixed together throughout the periodic table.

• Metals are located to the left of the staircase and non-metals are found to the right.

Which of the following elements is classified as a non-metal?

• Te

• H

• Ce

• As

Which of the following elements is a nonmetal?

• radium

• sodium

• arsenic

• nitrogen

Which of the following elements is considered a metal?

• hydrogen

• tungsten

• germanium

• phosphorous

Which interaction is most likely between an atom with high electronegativity and an atom with low electronegativity?

• formation of a covalent bond

• mutual electrical repulsion

• fusion of nuclei

• formation of an ionic bond