Atomic Structure Test Review

1. Describe the charge of each of the three subatomic particles. Proton + Neutron is neutral Electron –(neg)

2. Tell whether each of the subatomic particles is inside or outside the nucleus. Protons and neutrons in nucleus. Electrons outside nucleus.

3. Which of the subatomic particles contribute to the atom’s mass? Protons and Neutrons

4. Which subatomic particle has almost no mass? Electron

5. The number of what subatomic particle in atoms of the same element never changes? Protons

6. Which two subatomic particles can have different numbers even in atoms of the same element? Neutrons and Electrons

11. What tells you the exact number protons in an atom? The Atomic Number

12. If an atom has no charge (neutral), the number of which particles must be equal? Protons and electrons

13. The number of _______ of an atom determines which element it is. Protons

14. If an element has 15 protons, how many neutrons does it have? The element would be Phosphorus Mass # 31 - Atomic # -15 = Neutrons 16

15. If an element has an atomic mass of 200 15. If an element has an atomic mass of 200.59, what is the mass number? 201

16. If an element has 28 protons and a mass of 58 16. If an element has 28 protons and a mass of 58.69, what is the atomic number? 28 same as protons

17. If an element with 54 electrons is neutral, what is the atomic symbol? Xe

19. The ______ _______ is an average mass for that atom. Atomic mass

20. The mass number is the rounded off ______ ________. Atomic mass

21. The mass number can be determined by adding the ______ and ______. Protons and Neutrons

22. Which element has a mass of 106.42? Palladium

24. What surrounds the nucleus and each hold one or more electrons? Energy Levels

25. Where is almost all the mass of the atom contained? Nucleus

27. Which element in the carbon family has 41 neutrons? Mass # 73 Atomic # - 32 = Neutrons 41 Ge

28. Which element has 17 electrons? Cl

29. Draw a carbon atom. Label the protons, neutrons, electrons, nucleus, and energy levels.

30. To find the atomic number of the atom in #29 you would count the _______. Protons

31. What is the charge of just the nucleus of an atom? Positive

32. What subatomic particle do you count to determine what the element is? Protons

34. Atoms of different elements will have different numbers of protons.

36. In a neutral atom, the number of electrons is equal to the number of protons.

37. What is a valence electron? Electron in the outermost energy level

38. Which two particles give you most of your mass? Protons and neutrons