An isotope of cesium has 55 protons and 78 neutrons. What is the mass number of this isotope?

What is a solubility curve for

What is the mass (in grams) of 9.83 * 1024 molecules of methanol (CH3OH) ?

Which factors affect a river's load? a. river's slope c. streambed shape b. volume of flow d. all of the above

Element X has five valence electrons, element Y has one valence electron, and element Z has five valence electrons. Which two of these elements are most likely to have similar properties? Explain your answer

Classify ... use the periodic table to classify the elements potassium, bromine a d argon according to how likely their atoms lose electrons to form positive ions

Which outcome is not caused by gravitational force?

Explain the properties of the substance around us depend on the atoms and molecules that compose them

What is an ion (1 mark) what is the charge on a chloride ion (1 mark) what is an ionic bond (1 mark)

Why do northern lights appear in different colors? Because charged particles of solar wind ignite different gases in Earth's atmosphere Because electrons and protons of solar wind ignite the plasma present in the corona Because electrons and protons

Which organ system consists of the following levels of organization? kidney cells - - > kidney tissues - - > kidney A. excretory B. circulatory C. respiratory D. integumentary