Which of the following best describes an element? a A substance that cannot be broken down into another substance b Two or more substances together but not chemically combined c A solution salt and water d Two or more different atoms chemically bonded together

A substance that cannot be broken down into another substance

Explanation:

zfoods? ok, pressure is used to keep the heat inside and to keep the food perfect.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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