Category 1 Science STAAR Review

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?

• The 20 protons in each atom of calcium

• The density of calcium, which is 1.54 g/cm³

• The atomic mass of calcium, which is 40.078 amu

• The 2 valence electrons in each atom of calcium

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A model of an atom is shown below.

An atom or which element is represented by this model?

• Boron (B)

• Carbon (C)

• Neon (Ne)

• Sodium (Na)

Tags

NGSS.MS-PS1-1

How many valence electrons are in an atom of each element in Group 15 of the periodic table?

• 5

• 15

• 7

• 10

Four students were asked to complete a table for a science assignment. Each student selected one chemical from each of four groups on the periodic table and then classified each element as a metal, a nonmetal, or a metalloid.

Which table was completed correctly?

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Students were asked to identify the location of elements in the periodic table based on clues printed on game cards.

Based on the data, which periodic table shows the correct location of the four elements?

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Tags

NGSS.MS-PS1-1

Which of these elements is in this group?

• Lithium

• Strontium

• Aluminum

• Silicon

Which two elements on the periodic table are in the same period?

• Sn and Rb

• F and Cl

• K and Ba

• Se and Te

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

• Nitrogen (N)

• Sulfur (S)

• Arsenic (As)

• Silicon (Si)

Which statement does NOT correctly compare silicon with another element?

• Silicon is a better conductor of electricity than sulfur.

• Silicon conducts electricity as well as copper does.

• Silicon is a solid at room temperature, but argon is a gas.

• Silicon is less malleable than silver.

Aluminum, sulfur, and chlorine are elements found on the periodic table. Tests involving these three element would show that at normal room temperature -

• sulfur is malleable and aluminum conducts electricity

• chlorine is malleable and conducts electricity

• aluminum is malleable and conducts electricity

• all three elements are malleable and conduct electricity