# Focus On Physical Science: California Grade 8

## Chapter 4: Understanding the Atom

### Math Practice

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 1. Find the mass of eight protons. Need a Hint? A) 7.288 x 10-27 g B) 1.33816 x 10-24 g C) 1.340 x 10-23 g D) 1.33816 x 10-23 g 2. Find the mass of three electrons. Need a Hint? A) 5.025 x 10-24 g B) 5.018 x 10-24 g C) 2.733 x 10-27 g D) 2.733 x 10-28 g 3. Find the mass of two protons. Need a Hint? A) 3.3454 x 10-23 g B) 3.3454 x 10-24 g C) 3.350 x 10-24 g D) 1.822 x 10-27 g 4. Find the mass of six neutrons. Need a Hint? A) 1.005 x 10-23 g B) 1.003 x 10-23 g C) 1.005 x 10-24 g D) 5.466 x 10-27 g 5. Find the mass of nine electrons. Need a Hint? A) 8.199 x 10-27 g B) 1.505 x 10-23 g C) 1.5075 x 10-23 g D) 8.199 x 10-28 g 6. Find the mass of four protons. Need a Hint? A) 6.6908 x 10-23 g B) 6.6908 x 10-24 g C) 6.700 x 10-24 g D) 3.644 x 10-27 g 7. Find the mass of seven electrons. Need a Hint? A) 1.1725 x 10-23 g B) 1.171 x 10-23 g C) 6.377 x 10-27 g D) 6.377 x 10-28 g 8. Find the mass of five neutrons. Need a Hint? A) 4.555 x 10-27 g B) 8.364 x 10-24 g C) 8.375 x 10-23 g D) 8.375 x 10-24 g 9. Find the mass of four electrons. Need a Hint? A) 6.700 x 10-24 g B) 6.691 x 10-24 g C) 3.644 x 10-27 g D) 3.644 x 10-27 g 10. Find the mass of six protons. Need a Hint? A) 5.466 x 10-27 g B) 1.00362 x 10-24 g C) 1.005 x 10-23 g D) 1.00362 x 10-23 g