Explain why an element with a large atomic radius won't have a high electronegativity

Explanation:

The larger the radius of an atom, the lesser the electronegativity of the atom. This is because of the screening effect.

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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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.