38 an atom of the isotope 137 ba consists of how many

38. An atom of the isotope
137
Ba consists of how many protons (p), neutrons (n), and electrons (e).
A. 56 p, 137 n, 56 e B.56 p, 81 n, 56 e C. 137 p, 81, 56 e
D.56 p, 56 n, 56 e E.81 p, 56 n, 81 e
39. The elements in a column of the periodic table are known as ____ 40. An Anion is defined as _____
41. A magnesium ion, Mg 2+ has _____
42. An Oxide ion has _____
A. 8 protons and 10 electrons B. 10 protons and 8 electrons
C. 8 protons and 9 electrons D. 8 protons and 7 electrons
43. What are the two different ions present in the compound CaS? 44. What is the empirical formula for C
10
H
22
O
2
?

45. What is the law of conservation of mass?
46. Almost all the mass of an atoms is concentrated in the _______.
A. electrons B. protons C. nucleus D. neutron
47. The atomic number is equal to the number of ______ in the nucleus of each atom of an element
48. Give the foumula of iron( II) phosphate.
49. Give the formula of copper( II ) bromide.
50. Give the formula of ammonium sulfate.
A. (NH
4
)
2
SO
3
B. NH
4
SO
4
C. (NH
4
)
3
SO
4
D. (NH
4
)
2
SO
4
E. (NH
4
)
2
(SO
4
)
2