A sample of Ac-255 originally contained 8.0g. After 720 hours, how much of the original Ac-255 remains? The half-life of the isotope is 10 days. I will mark the Brainiest if your answer is correct.

Abullet found at a crime scene may be used as evidence in a trial if the percentage of metals match to the composition of metals in a bullet from the suspect's ammunition. a forensic scientist's analysis of the bullet shows that it contains 11.9 g of lead, 0.5 g of tin, and 0.8 b of antimony. what is the percentage of lead metal in the bullet? express your answers to the one's place.

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg

What role does weathering have in shaping earth’s surface? a) it allows sediments to fall out of a medium. b) it sediments settle on a new surface. c) it breaks down older material into sediments. d) it transports sediments to a different location. will give brainliest, answer quickly.