Why does electronegativity decrease from right to left within a period?

Which of the following is NOT a type of Kinetic energy? A. Nuclear B. Electrical C. Thermal D. Mechanical

Aluminium and phosphorus are close to one another in the Periodic Table but the P3 - ion is much larger than the Al3 + ion. Explain the reason for this change in size.

Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: CaO (s) + H2O (l) →Ca (OH) 2 (s) In a particular experiment, a 4.50-g sample of CaO is reacted with excess water and 5.45 g of Ca (OH) 2 is recovered.

When the electrons of an excited atom return to a lower energy state, the energy emitted can result in the production of (1) alpha particles (3) protons (2) isotopes (4) spectra

The number of moles of chloride ions in 250 ml of 4.00 M MgCL2

What occurs in a chemical reaction? Products are formed from reactants by the breaking and forming of new bonds. Products are formed without chemical bonds being broken. Reactants are formed without chemical bonds being broken.

What information does the atomic mass of an element provide

The following diagram represents a vertical cross section of sedimentary rock layers that have not been overturned. Which principle best supports the conclusion that these layers have undergone extensive movement since deposition?

What kind of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one to the other?

NaOH and bleach have several characteristics in common. They include all BUT one of the characteristics listed.