18 ) The efficiency of the machine with output is=30 N and input of 10 N= O 3
O 3%
30 %
O 0.33%

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock

the pseudoscience are like beliefs, theories, or like practices that are considered scientific

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.