Unit 5 Review

How many valence electrons are in an atom of each element in Group 14 in the periodic table?

How are the three elements in the image provided organized on the periodic table?

• Zirconium and Nickel are in the same group.

• Nickel and Titanium are in the same group.

• Zirconium and Nickel are in the same period. 1

• Nickel and Titanium are in the same period.

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside the nucleus. Which statements best describes the charges on the particles in this model?

• Either particle X or particle Y has a negative charge. Particle Z has a positive charge. 

• Either particle X or particle Y has a positive charge. Particle Z has negative charge. 

• Both particles X and Y have a negative charge. Particle Z has a positive charge. 

• Both particles X and Y have a positive charge. Particle Z has a negative charge. 

Tags

NGSS.MS-PS1-1

The atoms of a certain element each contain 11 protons and 1 valence electron. Which statement correctly identifies this element and describes its chemical reactivity? 

• The element is sodium, and is not very reactive.

• The element is fluorine, and is highly reactive.

• The element is fluorine, and is not very reactive.

• The element is sodium, and it is highly reactive.

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?

• Fluorine, F, and chlorine, Cl

• Boron, B, and aluminum, Al 

• Cobalt, Co, and nickel, Ni 

• Hydrogen, H, and cesium, Cs

Which family of elements does not combine with other elements?

 Which statements correctly compare metals and nonmetals? Check two the apply. 

• Metals are dull and brittle. Nonmetals are shiny and malleable.

• Metals are good insulators of electricity. Nonmetals tend to be good conductors of electricity. 

• Metals tend to be good conductors of thermal energy. Nonmetals tend to be good insulators of thermal energy. 

• Metals can be stretched into thin wires (ductile). Nonmetals cannot be stretched into thin wires.

Which of the following elements outlined in red is the most reactive?

• Lithium

• Carbon

• Oxygen

• Helium

Which of the following elements outlined in red is the least reactive?

• Lithium

• Carbon

• Oxygen

• Helium

Atoms of which two elements have a combined total of 23 protons?

• Boron (B) and carbon (C)

• None of these

• Sodium (Na) and magnesium (Mg)

• Silicon (Si) and Phosphorus (P