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An Yttrium Isotope Has 39 Protons and 50 Neutrons in Its

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An yttrium isotope has 39 protons and 50 neutrons in its nucleus. Which one of the following symbols accurately represents this isotope?


Definitions:

Early Majority

A group of consumers in the diffusion of innovation model that represents approximately 34 percent of the population; members don’t like to take much risk and therefore tend to wait until bugs are worked out of a particular product or service; few new products and services can be profitable until this large group buys them.

Pioneer

An individual or entity that is among the first to explore or establish something new in a field or area.

MP3 Player Market

Refers to the commercial segment involved in the manufacturing and selling of digital audio players that play music and media stored in the MP3 format.

Relative Advantage

The degree to which a new product or service is perceived as better than existing alternatives by consumers.

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