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.

1) henry moseley established a periodic table that arranges the elements by atomic number.

2) the atomic number increases from left to right on the periodic table.

3) metalloids have the characteristics of both metals and nonmetals.

Henry Gwyn Jeffreys Moseley (1887–1915) proposed that the number of positive nuclear charges (protons) in atom is equal to its atomic number in the periodic table.

Metalloids create a "staircase" down the periodic table.

For example, germanium (symbol: Ge) is a lustrous, hard, grayish-white metalloid in the carbon group.

Explanation: