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Which of these determines the identity of an element?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
Sodium contains 11 protons and 12 neutrons. How many electrons are in a neutral atom of sodium?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
Elements are described as pure substances because
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
What elements in the periodic table are least likely to combine with other elements?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
How many electrons would a neutral atom of potassium have?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
Which of these statements is false?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
What is the name and atomic number of the element in the first row fourth square down on the periodic table?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
How are the elements in the modern periodic table arranged?
The elements on the left side of a row have higher atomic mass than the elements on the right side
19
they can not be separated into parts by physical means
number of protons
noble gases
11
by number of protons
potassium, 19
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