Which statements accurately describe trends found in the periodic table? Check all that apply.

- Henry Moseley established a periodic table that arranges the elements by atomic number.
- The atomic mass decreases from left to right on the periodic table.
- The atomic number increases from left to right on the periodic table.
- Nonmetals create a “staircase” down the periodic table.
- Metalloids have the characteristics of both metals and nonmetals.

- Henry Moseley established a periodic table that arranges the elements by atomic number.

- The atomic number increases from left to right on the periodic table.

- Metalloids have the characteristics of both metals and nonmetals.

Explanation:

- Henry Moseley established a periodic table that arranges the elements by atomic number.

- The atomic number increases from left to right on the periodic table.

- Metalloids have the characteristics of both metals and nonmetals.

are all correct

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.