Which characteristic of the elements increases as you move across a period from left to right?

A. Magnetic attraction
B. Atomic number
C. Year discovered
D. Metallic nature

THE ANSWER SHOULD BE Atomic number

Sry if wrong

Explanation:

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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