Westrup
8th Grade Science STAAR Review
Name:__________________
Category 1: Matter and Energy – 8th Grade TEKS
The student will demonstrate an understanding of the properties of matter and energy and their interactions.
TEKS 8.5A describe the structure of atoms, including the masses, electrical charges, and locations,
of protons and neutrons in the nucleus and electrons in the electron cloud. Readiness Standard
Fill in the “T” chart below using the phrases in the word bank below.
Protons
Neutrons
Has mass (2)
Has negligible (no) mass
Found in nucleus (2)
Negatively charged
Electrons
Positively charged
No charge
Found outside nucleus (in electron clouds)
Label the lines on the diagram above: (proton, neutron, electron, nucleus)
What is the mass of the atom above? __________
What is the charge of the atom above? _________
What is the atomic number of the atom above? __________
Use your periodic table to name this element _________________________
Use the key on your periodic table/formula chart to label the diagram below. Then answer the
questions that follow.
17
Cl
Chlorine
How many protons does Chlorine have? _____
How many electrons does Chlorine have? ____
How many neutrons does Chlorine have? ____
35.45
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