Chem Review 2

Valence electrons are found 

• in the nucleus of the atom

• near the nucleus of the atom

• in the last energy level of the atom

• in the brain of the atom

Protons

• have a positive charge and are found in the electron cloud

• have a negative charge and are found in the nucleus

• have a part charge and are found in the nucleus

• have a positive charge and are found in the nucleus

Elements found in the same group of the periodic table will normally have

• the same number of protons

• the same number of electrons

• the same number of neutrons

• the same number of valence electrons

An unbonded atom has a _____________ charge while the nucleus of the atom has a ___________________ charge.

• negative, positive

• positive, negative

• neutral, positive

• neutral, negative

According to the law of conservation of mass, which statement about chemical reactions is true?

• Energy is created as atoms are destroyed in chemical reactions

• Every atom destroyed in a chemical reaction must be replaced.

• Atoms cannot be created or destroyed by a chemical reaction

• Atoms are created by some reactions and destroyed by others.

One atom has 93 protons while another atom has 94 protons.  Are they atoms of the same element.

• Yes

• No

• Yes, if the second element gained protons in order to bond.

• Cannot be determined from the information given.

The nucleus of atoms contains

• protons and electrons

• protons and neutrons

• Neutrons and electrons

• Protons only

The formation of a chemical bond involves

• sharing, gaining or losing of protons

• sharing, gaining or losing of protons and electrons

• sharing, gaining or losing of electrons

• sharing, gaining or losing of neutrons

When an atom loses electrons, the atom becomes

• postively charged

• negatively charged

• forms a covalent bond

• atoms do not lose electrons, they lose protons

Which of the following is not a substance

• Milk

• NaCl

• Silicon, Si, 14

• MgO