What was so incredible about Mendeleev's periodic table?

it predicted the existence of elements not yet discovered

How could you estimate an atom's atomic weight?

add up the number of protons and neutrons

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Atoms and the Periodic Table

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A # science kahout to introduce #atoms and the #periodic table. Based on materials found at http://www.howaboutscience.com/periodic-table

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Questions 21

Answers

1
What are valence electrons?
they determine the chemical properties of an atom
all of these are true
they determine if an atom will undergo a chemical reaction
they are found in the outermost orbits of an atom
2
What do we call an atom that has gained or lost an electron?
an isotope
none of these
a electrobobaloid
an ion
3
What was so incredible about Mendeleev's periodic table?
it predicted the existence of elements not yet discovered
it had 92 elements
it placed elements in rows or periods
you could get it for a cheap price
4
Which of these are the building blocks for matter?
molecules
protons
cells
atoms
5
Who created the first periodic table of elements?
Dalton
Mendeleev
Bohr
Einstein
6
Which of these is true of electrons?
all of these are true
they have a positive charge
they orbit the nucleus
they have mass
7
Which of these cannot be broken down into anything simpler?
molecules
compounds
elements
the nucleus
8
What is the another name for the number of protons in every element?
the atomic mass
the atomic weight
the proton number
the atomic number
9
Which of the following are true of protons?
they are found in the nucleus
they have mass
they have a positive charge
all of these are true
10
How are elements arranged in the periodic table?
by the number of neutrons
alphabetically
by atomic number
by atomic weight
11
Who proposed a model of an atom similar to planets orbiting the sun?
John Dalton
J.J. Thomson
Neils Bohr
Earnest Rutherford
12
Who proposed a model of an atom that was similar to a chocolate cupcake?
Neils Bohr
JJ. Thomson
Earnest Rutherford
John Dalton
13
How could you estimate an atom's atomic weight?
weigh them on very small scale
add up the number of neutrons and electrons
add up the number of protons and electrons
add up the number of protons and neutrons
14
What do we call the dense center of an atom?
neutron
proton
electron
nucleus
15
Patterns emerge if we list the elements in order. What is this periodic repetition called?
none of these is true
the Law of Periods
the Law of Repeating Patterns
the Periodic Law
16
What does the periodic table help us predict?
an element's behavior
the number of electrons an element has
the number of protons an element has
all are true
17
If an element has 12 protons, how many electrons does it have?
none
24
12
11
18
What is a chemist's tool for organizing information about elements?
the periodic table
the periodic notebook
the periodic closet
the periodic shelf
19
What do we call a vertical column of elements in the periodic table?
a period
a row
a cluster
a family
20
How could we classify most of the elements in the periodic table?
as gases
as metaloids
as nonmetals
as metals
21
What do we call H, He and Na?
all are true
chemical symbols
chemical equations
chemical formulas

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