What does X represent for this transmutation?

49Be+24He→X+01n

513B

613C

25He

612C

Arrange the following elements from greatest to least tendency to accept an electron. Rank from greatest to least tendency to accept an electron. To rank items as equivalent, overlap them.

Which statement about scientific explanations is true? A. Scientific explanations are open to change. B. Scientific explanations are never reliable. C. Scientific explanations are always correct. D. Scientific explanations are rarely proven wrong.

This element is often used to block out dangerous radiation. a. lead b. carbon-12 c. uranium-236 d. uranium-238

John dalton proposed a theory that all matter is made up of individuals particles which cannot be divided. what were those particles?

In a reaction of an acid with a base, the pH changes to a value that is closer to what?

The elements that contain electrons in an F sublevel near the highest occupied energy level are referred to as? A. Alkali metals B. Alkali earth metals C. transition metals D. inner transmission levels

A 5.91 g unknown sample analyzed by elemental analysis revealed a composition of 37.51 % C. In addition, it was determined that the sample contains 1.4830 * 1023 hydrogen atoms and 1.2966 * 1023 oxygen atoms. What is the empirical formula?

How can we use the mole to convert between the mass and the volume of a substance?

What is the definition of convection a. the process in which energy is released by molecules breaking apart b. the process in which energy is released by molecules breaking apart c. transfer of heat between two objects that are touching d.

Describe how space exploration has changed the economy and culture, and include one specific example.