Atoms
What are the numbers of protons, neutrons, and electrons in an isotope of titanium with a mass number of 50?
22 p, 28 n, 22 e
The nucleus of the atom contains what?
Protons and Neutrons
How many valence electrons are there in the elements in family 16 of the periodic table?
6 valence electrons
Most elements on the periodic table are ________
a. metals
b. nonmentals
c. metalloids
Metals
What are shared in covalent bonds?
Electrons
The mass number is equal to the number of _____________ plus the number of __________
Protons, neutrons
Which group on the periodic table makes up the alkaline earth metals?
Group 2
Metalloids are also called
semiconductors
When compared to sulfur-32, sulfur-34 has more —
Neutrons
What is an isotope?
Have the same number of protons but a different number of neutrons
What is the group called in groups 3-12 of the periodic table?
Transition Metals
How many valence electrons does group 13 have on the periodic table?
3
Convert this to grams:
5.50 mol of iron
307 g Fe
Group one in the periodic table are known as _______________
alkali metals
The atomic number of each element tells us what?
How many electrons it has
What can be determined if only the atomic number of an atom is known?
A. the total number of neutrons in the atom, only
B. the total number of protons in the atom, only
C. the total number of protons and the total
number of neutrons in the atom
D.the total number of protons and the total
number of electrons in the atom
The total number of protons and the total number of electrons in the atom
How many neutrons does calcium-45 contain?
25
Which group in the periodic table is considered stable?
Group 18
The law that states that the repeating chemical and physical properties of elements change periodically with the atomic number of elements
Periodic Law