Identify the elements in the second, third, fourth, and fifth periods that have the same number of highest-energy-level electrons as barium.

What do an eye, a telescope, and a microscope have in common

Which group of nuclear emissions is listed in order of increasing charge? (1) alpha particle, beta particle, gamma radiation (2) gamma radiation, alpha particle, beta particle (3) positron, alpha particle, neutron (4) neutron, positron, alpha

Which notation is used to represent gamma decay?

Element definition in chemistry

How many magnesiums are in 2mg2 O3

Which of the following is not a drawback of using lithium batteries? A. Lithium's reactivity can cause explosions. B. Lithium batteries require the use of toxic materials. C. Lithium is more easily oxidized than any other metal. D.

Considering the concept of surface area affecting the rate of reaction, explain why grain storage silos sometimes explode spectacularly?

What solution can you add to of the mixture of NH4 (aq) and Ca2 (aq) to precipitate one cation while keeping the other cation in solution?

Which substance was developed by chemists

Pure gold is defined as having 24 carats. When mixed in an alloy, the carats of gold are given as a percentage of this value. For example, a piece of jewelry made with 50% gold has 12 carats.