Subatomic Particles
3. Which of the following subatomic particles is in the nucleus, has a mass of 1 AMU, and has no charge?
B. neutrons
16. The 3 classes of elements are ________, ________, and ________.
C. metals, nonmetals, and metalloids
9. On the Periodic Table of Elements rows are called __________ and columns are called ___________.
B. periods; groups
5. Cations have a ______ charge due to _______ of valence electrons.
D. positive; loss
6. Which number represents the weighted average mass of all the naturally occurring isotopes of nitrogen (N)?
C. 14.01 AMU
26. What is the formula to determine the number of neutrons an atom contains?
A. n0 = Mass Number - Atomic Number
17. In the Periodic Table of Elements, group ___ are alkali metals, and group ___ are alkaline earth metals.
D. 1A; 2A
10. On the Periodic Table of Elements, each _______ represents ___ electron shell/energy level.
A. period/row; 1
7. Magnesium lost 2 electrons. Which type of ion is it, and what is the symbol with a charge?
D. cation; Mg2+ or Mg+2
28. In an isotope, an atom has lost or gained _______.
C. neutrons, or n0
32. This element has an atomic number of 11. Which element is it?
B. sodium (Na)
19. Which of the following elements is matched with the correct classification?
A. hydrogen-nonmetal
11. Which element has 3 electron shells and 7 valence electrons?
A. chlorine (Cl)
8. Bromine gained 1 electron. Which type of ion is it, and what is the symbol with a charge?
A. anion; Br-
29. A carbon-14 isotope has ______ neutrons.
C. 8
27. How many neutrons are in a neutral barium atom?
A. n0 = 137 - 56 = 81
24. Metals ______ valence electrons to form _______ and have a full valence shell. One example of this is Mg2+.
C. lose; cations
23. Which family on the periodic table is unreactive because it has a full valence shell and satisfies the octet rule?
C. noble gases
25. Nonmetals ______ valence electrons to form ______ and have a full valence shell. One example of this is S-.
D. gain; anions
31. Classify this atom. 15B
D. neutral isotope
15.How many valence electrons(ve-) and core electrons(ce-) does krypton (Kr) have?
D. ve-: 8; ce-: 28
22. Which family on the periodic table is the most reactive, is likely to form a 1- charged ion, and all members of the family are diatomic elements?
C. halogens
14. Generally, the ____________ on The Periodic Table of Elements indicates how many valence electrons an atom has.
C. groups or columns
30. Classify this atom. 35Ca2+
C. ion & isotope
33. Use the isotope notation to decide how many neutrons this atom contains.
148O2-
A. 6 neutrons