How can scientists determine when a radioactive substance will no longer be dangerous

What is a "curie"? standard charge of alpha particles mass of one alpha particle standard emission rate of alpha particles a unit of gamma radiation

Which of the following elements is radioactive and synthetic? A. cesium B. xenon C. barium D. neptunium

What mass of carbon dioxide (co2) can be produced from 86.17 grams of c6h14 and excess oxygen?

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca (OH) 2?

How many kilojoules of energy are absorbed when 800.0g of water is heated from 20.0º C to 50.0º C

Which of the following is not true about the importance of the carbon cycle to living things? a. Plants use carbon dioxide to make energy. b. Carbon is the second most abundant molecule in organisms. c.

Fruit flies can either have a brown body or a black body. The allele for a brown body (B) is dominant to the allele for a black body (b). A brown fruit fly was crossed with a black fruit fly as shown below.

A light-year measures the distance a light beam can travel in one year. One light-year is equal to 9 500 000 000 000 kilometers.

The first ionization energy, e, of a potassium atom is 0.696 aj. what is the wavelength of light, in nm, that is just sufficient to ionize a potassium atom? values for constants can be found here.

A gene is a to a chromosome as (A) a pea is to a pod (B) a front to a back (C) a bike is to a car (D) a building is to a window