The mass defect is the result of what action accurring

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.