Physical Science Unit 1

According to the periodic table, which statement correctly describes the change from a neutral atom of an element to its ion?

• A fluorine atom forms a F1- ion by losing one electron.

• A sodium atom forms a Na1+ ion by losing two electrons.

• A magnesium atom forms a Mg2+ ion by gaining two electrons.

• A phosphorus atom forms a P3- ion by gaining three electrons.

Christy is studying sodium in the following periodic table of elements.

She makes the following list of possible properties for sodium: Symbol is Na

Is a transition metal

Atomic number is 11

Has one valence electron

Which of these should Christy remove from her list?

• Symbol is Na

• Is a transition metal

• atomic number is 11

• has one valence electron

Metals in group 1 on the periodic table most commonly form which type of ion?

• 2^- ion

• 1^- ion

• 1+ ion

• 2+ ion

A model of two atoms is shown below, Which of the following would result if a covalent bond is formed between the two atoms?

• Atom 1 would transfer two protons to atom 2.

• Atom 2 would transfer four neutrons to atom 1.

• Each atom would share two of its electron with the other atom.

• Each atom would share four of its electron with the other atom.

A scientist is measuring the mass of two boron atoms. One atom has a mass of 10 units. The other atom has a mass of 11 units. This is a model of a boron atom with a mass of 11 units.

Which subatomic particle needs to be removed from the model to represent a boron atom with a mass of 10 units?

• Electron

• Neutron

• Proton

• Whole neucleus

Which of the following statements best explains why atoms bond?

• Atoms bond to make new substances.

• Atoms bond to become less chemically stable.

• Atoms bond to change from a liquid to a solid.

• Atoms bond to become more chemically stable.

In order to be identified as the element carbon (C), an atom must have

• 6 protons

• 6 neutrons

• 12 protons

• 12 electrons

The ions of an unknown element are found to contain 15 protons, 18 electrons, and 16 neutrons. It has an atomic mass of 31. The identity of the unknown element is

• sulfur (S)

• phosphorus (P)

• gallium (Ga)

• argon (Ar)

Which of the following models correctly represents the compound phosphorus trichloride (PCl3)?

• 
• 
• 
• 

Which of the following lists includes a metal, a metalloid, and a nonmetal?

• lithium (Li), aluminum (Al), and nitrogen (N)

• sodium (Na), silicon (Si), and tin (Sn)

• hydrogen (H), aluminum (Al), and tin (Sn)

• sodium (Na), lead (Pb), and bismuth (Bi)