STAAR Category 1
Flashcard
•
Chemistry
•
7th - 8th Grade
•
Practice Problem
•
Hard
Wayground Content
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16 questions
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1.
FLASHCARD QUESTION
Front
How many protons are present in Hafnium (Hf) with a mass number of 178?
Back
72 protons
2.
FLASHCARD QUESTION
Front
An atom of an element has 36 protons, 36 electrons, and a mass number of 84. How many neutrons?
Back
48
3.
FLASHCARD QUESTION
Front
What types of particles are found in the cloud surrounding the atom's nucleus?
Options: positively and negatively charged particles , negatively charged particles only, neutral and positively charged particles, positively charged particles only
Back
negatively charged particles only
4.
FLASHCARD QUESTION
Front
What is the mass number of a potassium (K) atom that has 20 neutrons?
Back
39
5.
FLASHCARD QUESTION
Front
What is the best description of an electron?
Back
Negative charge and much less mass than a proton.
6.
FLASHCARD QUESTION
Front
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the nucleus?
Back
+25
7.
FLASHCARD QUESTION
Front
Which statement accurately describes an atom of tin?
Back
tin atoms have 50 protons
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