1- What controls the reactivity or how like an element is to bond with another element? HELP PLEAS i need the best response

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/rzNrBcz

The pituitary gland secretes hormones, which can stimulate growth.

The thyroid gland produces hormones which regulate the body's metabolic rate as well as heat and digestive function

The parathyroid glands are 4 tiny glands that control the bodies calcium level.

The adrenal gland produces hormones that are vital to life, such as cortisol, and aldosterone.

The pancreas regulates enzymes and produces insulin.

The ovaries produce and release eggs into the female reproductive tract and the mid point of each menstrual cycle.

The testes produce testosterone.

You can look these up on google also.