Answer:
an atom is the basic unit of a chemical element.
a particle is a minute portion of matter.
Answer:
Explanation:
The 1000-ml graduated cylinder with marks every 100 ml has least count of 100 ml . It means it can not measure a volume less than 100 ml . It can also measure volume in the integral multiple of 100 ml like 200 ml , 300 ml , 400 ml etc perfectly . All these have significant figure of one .
It can not measure volume like 150 , 250 , 255 , 760 etc because these measurements are not the integral multiple of 100 . 750 is not a integral multiple of 100 so it can not measure volume of 750 ml.
If the solution is BASIC than it will turn purple but if ACIDIC it will turn pink.
Look at the periodic table (Boron has 3) and count up from there
