Which of the three subatomic particles is responsible for determining the reactivity of an element?

The three subatomic particles are the electron, proton and neutron

Explanation:

There are three subatomic particles in an element which are responsible to determine their reactivity are called as electrons, protons and neutrons. These three particles have different charges associated with them like electron are negatively charged,  protons are positively charged and neutrons are neutrally charged  (i.e) no net electric charge is associated with them. The nucleus is the center of the atom.

what are the options.

explanation:

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

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im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.