The Atom
Atomic models
Zapne
Ions
Isotopes
Random trivia
100
The nucleus of an atom contains ______ and _________
protons and neutrons
100
According to the atomic models... who first discovered the electron?
JJ Thompson in 1897
100
The number of protons and electrons in a neutral atom is known as its __________
atomic number
100
A charged atom is known as a
ion
100
True or false
All atoms of the same element must have the same number of neutrons.
False
100
Which type of matter has a definite volume but no definite shape?
Liquid
200
True of false:
The number of protons in a neutral atom is always equal to the number of electrons in a neutral atom.
True
200
According to BOHR's model, the element palladium would have how many levels of energy to represent their electron shells
4 
200
A chlorine atom has 17 protons and 18 neutrons. What is its mass number?
35
200
True or false: An atom with more electrons than protons is a positively charged ion
false
200
- Why is the mass number not always a whole number on the periodic table?
The atomic masses listed in the periodic table are not whole numbers because they are weighted averages of the masses and abundances of all of the isotopes of that element.
200
What percentage of Earth’s total water is salt water?
97%
300
True or false
An atom with more electrons than protons is a positively charged ion.
false
300
What model does this look like?
JJ Thompsons plum pudding model
300
Find the number of protons, neutrons, and electrons in a neutral argon-40 atom.
Z= 18 A= 39.94 P=18 N= 22 E= 18
What element would this be?
Argon
300
An atom has 20 protons and 18 electrons. What is its charge?
+2, since it has 2 more protons than electrons
300
How many neutrons does an atom of uranium-238 have?
146
300
What term measures the greenhouse gases emitted by a person or an organization?
carbon footprint
400
What do isotopes of the same element have in common?
The same number of protons
400
What would this image most likely look like according to the atomic models
Schroedingers 3D model
400
Z= 7
A = 14.00067
P= 7 N = 7.00067 E= 5
Nitrogen +2
400
How many electrons does an oxygen ion (O²⁻) have?
10
400
Determine the atomic number, mass number, and neutron count for an atom with 92 protons and 143 neutrons and name what element would it be
uranium
Atomic number = 92, Mass number = 235, Neutrons = 143
400
What famous exclamation about water displacement is Greek mathematician and physicist Archimedes credited for?
Eureka!!!
500
Which experiment led to the discovery of the nucleus and who conducted this experiment?
Gold Foil experiment
Ernest Rutherford
500
The atomic model that describes electrons as existing in probability clouds is called the __________ model.
Quantum mechanic model
Schroedinger
500
Z= 13
A= 26.98
P= 13 N= 14 E= 15
What element are we talking about?
Aluminum -2
500
Why are ions formed? Name at least 2 reasons
- Stability: Atoms seek to achieve a stable electron configuration, often resembling the nearest noble gas. This stability is typically reached by having a full outer electron shell.
- Electron Transfer by chemical reactions or chemical bonds: When an atom loses one or more electrons, it becomes positively charged (cation). Conversely, when it gains electrons, it becomes negatively charged (anion). This transfer often occurs during chemical reactions or formation of chemical bonds, particularly between metals and non-metals.
- Electronegativity: Differences in electronegativity between atoms can lead to ionic bonding. Atoms with high electronegativity tend to attract electrons, while those with low electronegativity tend to lose them.
- Environmental Conditions: Factors like temperature, pressure, and the presence of solvents can influence ion formation. For example, in aqueous solutions, water can help facilitate the dissociation of ionic compounds into their respective ions.
500
An element has two naturally occurring isotopes: one with a mass of 10.01 (20%) and another with a mass of 11.00 (80%). Calculate its total atomic mass.
(Answer: (10.01 × 0.20) + (11.00 × 0.80) = 10.80 amu)
500
You may know that in photosynthesis, plants turn carbon dioxide into oxygen, but what other element is integral to this process?
Magnesium