The difference between an atom like ca, and an ion of an atom, like ca2+, is a) the number of protons. b) the number of neutrons. c) the number of proteins. d) the number of electrons.

Option (D) is the correct answer.

Explanation:

Atomic number of an atom represents the number of protons present in an atom. Also, when an atom is neutral then the number of protons equal the number of electrons of the atom.

For example, electronic distribution of calcium is 2, 8, 8, 2. So, when calcium loses two electrons to gain stability then it becomes .

That is, number of electrons decreases.

Hence, we can conclude that the difference between an atom like Ca, and an ion of an atom, like Ca2+, is the number of electrons.

answer: c

explanation:

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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