Chapter 1: Fundamentals of Chemistry (exam deck) Flashcards
Orbiting the central region of an atom are negatively charged
electrons
Anions are ions that have a ______ net charge.
negative
If the atomic number of an element is 6 and its mass number is 13, how many protons are contained in the nucleus?
6
If the atomic number of an element is 6 and its mass number is 13, how many neutrons are contained in the nucleus?
7
Two isotopes of an element have different ____.
mass number
The principal quantum number best describes which of the following characteristics?
size of the electron cloud
The electron configuration of the nitrogen atom (Z=7) is ____.
1s2
2s2
2p3
In the periodic table, all of the elements in a horizontal row are referred to as ____.
Period
Which of the following is an incorrect orbital notation?
Select one:
a. 4f
b. 2d
c. 3s
d. 2p
e. 5f
b. 2d
What is the mass number of an atom that contains 19 protons, 19 electrons, and 20 neutrons?
39
The nucleus of an atom consists of 8 protons and 6 neutrons. the total number of electrons present in a neutral atom of this element is
8
Convert 3.45 x 10^-5 into decimal form.
0.0000345
This is a substance that is made entirely from one type of atom.
Element
An object has a mass of 10 grams and a volume of 2 mL. What is the density of the object?
5 g/mL
Which element has a smaller number of electrons? Copper or Silver?
Copper
Electronegativity is: (which of the following definitions?)
a. how strongly an atom pulls electrons to itself when it is bonded to other atoms
b. how much energy is needed to take an electron away from an atom
c. how large an atom is
d. the energy needed to add an electron to an atom
e. none of the choices
a. how strongly an atom pulls electrons to itself when it is bonded to other atoms
Which of the following has the largest atomic radius?
Elements: C, Si, Ge, Sn
Sn
Which has the lowest ionization energy?
Elements: Be, Sr, Ca, Mg
Sr
Which has the highest electronegativity?
Elements: Na, Al, S, Cl
Cl
Which is a possible set of quantum numbers for a valence unpaired electrons in ground state atom of chlorine (Cl)?
Select one:
a. n=3, l=1, ml=0, ms= -1/2
b. n=2, l=3, ml=1, ms=1/2
c. n=1, l=2, ml=2, ms=1/2
d. n=, l=0, ml=2, ms=1/2
e. n=3, l=5, ml=2, ms=1/2
a. n=3, l=1, ml=0, ms= -1/2
What is the possible ml value for the s orbital?
0
The atomic number of an atom is based upon the number of:
protons
