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Terms in this set (34)
ALL atoms of the same element have:
the same number of protons.
If Atom #1 has 19 protons and 22 neutrons, and Atom #2 has 20 protons and 22 neutrons, are these isotopes of the same element?
No, because they have different numbers of protons.
The mass number indicates:
the total number of protons and neutrons.
Which element has a mass number of 12 and contains 6 neutrons?
Carbon
The nucleus of an atom:
is positively charged.
The nucleus of an atom is composed of _____.
Protons and neutrons.
Since an equal number of electrons are needed to balance the charge of the protons in the nucleus, how many protons and electrons are found in an atom of nitrogen (atomic number 7)?
7 protons, 7 electrons
When locating the atomic number for an element on the periodic table, the atomic number can be found _____ the symbol for the element.
above
The atomic number gives the number of _____ in the nucleus of an atom.
protons
Elements in Group 2 are known as the _____.
alkaline earth metals
Which of the following can be found in the second period of the periodic table?
Lithium (Li)
Which of the following will react violently with water to form a base?
Potassium (K)
Which of the following is the poorest conductor of electricity?
Fluorine (F)
Which
element is found in the group described by the statement below?
This group contains poisonous, very reactive elements often used in bacteria killing or household cleaners.
Iodine (I)
Which of the following is not a way that metals are important to humans?
They can be used as fuels for cars.
Metals are generally _____ at room temperature.
Solids
Which of the following is true about the reactivity of metals?
The reactivity of metals varies greatly.
How do metals bond?
By sharing electrons with other metal ions in what is called a sea of electrons.
Which of the following defines a metal?
Metals are lustrous and malleable.
A metalloid conducts electricity well in hot temperatures, but acts more like an insulator when the temperatures are cooler. What is a good way to describe this property?
A semiconductor
Some metalloids, such as boron, have which type of texture?
Brittle
Where could you find materials made from metalloid elements in your home?
Electronic devices
Which of the following is NOT a metalloid?
Bromine
What happens when a metalloid gets heated up?
It conducts more electricity, allowing electrons to move more freely.
Where are nonmetals located on the periodic table?
On the right side, except hydrogen, which is in the top left corner
What is/are a likely product(s) of the reaction between a metal and a nonmetal?
An ionic compound
How do nonmetals generally react with each other?
They form covalent bonds and share electrons with each other.
Which of the following are characteristics used to define nonmetal elements?
All of the answers are correct.
The majority of nonmetals naturally occur as which state of matter?
Gas
Which of the following is NOT a noble gas?
Hydrogen
Noble gases were:
Discovered later than most elements because they do not react or form compounds in nature
Noble gases are:
All of these
Noble gases have all of the ... they need. This makes them avoid forming compounds and undergoing reactions.
electrons
Which noble gas is known to cause cancer?
Radon
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