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
The electrons of iron have probable locations in a region of space around the nucleus.
C
Iron atoms combine with other atoms in whole number ratios to form compounds.
D
Chemical reactions that involve iron do not create new atoms of iron.
Explanation
Modern atomic theory describes electrons as having probable locations in regions of space around the nucleus, rather than fixed paths. Dalton’s theory treated atoms as indivisible particles and did not include electrons or their locations. The other statements—atoms make up elements, atoms combine in whole-number ratios, and chemical reactions do not create or destroy atoms—are consistent with Dalton’s theory.
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