Iron, an element with the chemical symbol Fe, is an important element. It is used to make steel and is part of the substance that transports oxygen throughout the human body. Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?
Answer
A
The element iron is composed of small particles called atoms.
B
Chemical reactions that involve iron do not create new atoms of iron.
C
The electrons of iron have probable locations in a region of space around the nucleus.
D
Iron atoms combine with other atoms in whole number ratios to form compounds.
Explanation
Modern atomic theory describes electrons as having probable locations in regions of space around the nucleus, rather than fixed paths. Dalton’s theory did not include this model of electrons. The other statements are ideas included in Dalton’s theory: atoms form compounds in whole-number ratios, atoms are not created in chemical reactions, and elements consist of atoms.
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