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☆☆☆☆☆Cards in this guide (15)
How many elements have been identified
118
How did Mendeleev arrange chemical elements
by atomic mass
What are atoms with nuclei that contain the same number of protons but a different number of neutrons called
isotopes
Atoms have no overall electric charge
true
Where should all laboratory materials be returned
To their proper places.
What can cities do to protect their citizens from risks associated with natural hazards
use stronger materials when building overpasses and bridges
Which of these describes the charges of an atom's electrons and protons
equal in size but opposite in charge
Which of these are elements that occur most in nature
isotopes
What are the properties of an element more closely related to
its atomic number There are there properties of an element to mass. The three properties are density, melting and electrical.
Which type of decisions require the use of critical evaluation skills
Fuhk People Start Putting The Right Answers ! ! ! Ugh This Web Site is Wack !
How should measurements be made when gathering data
measurements should be made precisely to ensure accuracy (:
What term refers to a source of danger that poses a threat
A risk
Where would you find the safety symbol for fume safety
Not everything has a symbol for it. The concept of fume safety, if it is a concept, does not have a specific symbol.
What term best defines two or more atoms joined by a chemical bond-
The term that best defines two or more atoms joined by a chemical bond, is a covalent bond.
If you spill a chemical on yourself the first thing to do is tell the teacher
True
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