Which of these determines the identity of an element?

Sodium contains 11 protons and 12 neutrons. How many electrons are in a neutral atom of sodium?

Elements are described as pure substances because

The nucleus of an atom contains

What is the name and atomic number of the element in the first row fourth square down on the periodic table?

How many electrons would a neutral atom of potassium have?

How are the elements in the modern periodic table arranged?

What elements in the periodic table are least likely to combine with other elements?

Which of these statements is false?

Carbon and oxygen combine chemically to form carbon dioxide. Carbon dioxide is

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