The half-life of a certain radioactive element is 1250 years. what percent of the atom remains after 7500 years?

How many compounds are in a wooden block

Determine the mass of a sample of 3.6moles of CaCl2

Which statement about temperature, humidity, and pressure in an air mass is true? A. The temperature is the same throughout but the humidity and pressure vary widely. B.

An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to? a. group 2 b. group 4 c. group 16 d. group 18

A farmer wants to know if a new pesticide will produce better tomatoes than his old pesticide. Which of the following is the best hypothesis to use to address his question? O A.

What type of mixture is chicken noodle soup? A heterogeneous mixture, because the different components are mixed evenly within the substance A heterogeneous mixture, because the different components are mixed unevenly within the substance A

Quem criou a teoria do átomo

What is the Ph of. 00001 molar HCl solution? a. 1 b. 9 c. 5 d. 4

While washing his hands before the client consultation with Chloe, Jayden dropped some water onto the countertop. When he came back later to wipe it up, it has evaporated. What happened to the drops of water?

In terms of atomic structure, explain why the atomic radius of K is larger than that of Na