Pencil "Lead" (Graphite) Is Made Primarily of

Q6: An atom that has more protons than

Q7: Solutions are<br>A) homogeneous mixtures.<br>B) heterogeneous mixtures.<br>C) nonuniform

Q8: Neptunium is an example of<br>A) A compound<br>B)

Q9: The electrons in the outermost shell are

Q10: Which of the following Period 3 atoms

Q12: Elements in Period 2 of the periodic

Q13: Which of the following Period 4 elements

Q14: When the atoms of two or more

Q15: About 15% by mass of Earth's core

Q16: Which of the following is a positively