Question

Which of the following items are pure elements—that is, made up of only one type of atom?

A. Cake
B. Iron
C. Hydrogen

Answer 1

C. Hydrogen

Why?: because it’s the simplest of atoms consisting of just 1 proton and 1 electron. It is also and element (H), with an atomic number of 1.

Answer 2

Step-by-step explanation:

Cake: Its a mixture. Reason : Cake contain various ingredient which can act as compound alone and on mixing these compound properties of each compound remain the same even after the formation of cake.

Iron : Iron has four naturally-occurring stable isotopes, 54Fe, 56Fe, 57Fe and 58Fe

Hydrogen : The hydrogen atom is the simplest of all atoms: it consists of a single proton and a single electron. In addition to the most common form of the hydrogen atom that is called protium, two other isotopes of hydrogen exist: deuterium and tritium.

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