If element X has 99 protons, how many electrons does it have

What are you objects are often arranged by their properties

How did Bohr solve the contradiction with physics with his model of an atom

Pb (CH3COO) 2 + H2S - -> PbS + CH3COOH 1. How many moles are produced of PbS when 5.00 grams of Pb (CH3COO) 2 is reacted with H2S? Make sure to show your work to get full credit. 2. What type of reaction is shown in the reaction above?

How many neutrons are in the radioactive isotope? 40 19 21 20

If only 1/2 the energy necessary to go between the 1s and 2s level was available, will an electron go to the 2s?

A cracker crushed in water will test positive with iodine but negative with benedict's solution. A cracker crushed in water has another chemical called amylase added to it.

Explain why a balloon filled with O2 at room temperature collapses when cooled in liquid nitrogen where as balloon filled with He does not

Which mixture can be separated by using the equipment shown below?

El agua de Mar es una mezcla homogenea o disolucion Y El agua corriente Y El aire Y LA lejia Y Los refrescos con gas Y El suero fisiologico Y Las monedas Y LA leche Y LA gelatina Y Los productos de higiene Y El merengue

The component which dissolves in a solution is called the ...