A particular nuclide has a mass number of 21 and contains 11 neutrons. What element is it? a. hydrogen b. neon c. sodium d. scandium

What does emit mean in chemistry

Name the folowing ionic compound MgCl2

Select all of the answers that apply. what are the two main ingredients in air? oxygen carbon dioxide nitrogen helium hydrogen

What is the purpose of interphase in the eukaryotic cell cycle?

The graph below shows the electronegativity values for the first six main group elements in Period 2 of the periodic table.

Calculate zeff for a valence electron in an oxygen atom.

Which of the following are physically properties of a penny

Complete the following statements about the functions of the digestive system. The starts an involuntary swallowing action when it senses food. The squeezes food down the digestive tract by an involuntary synchronized muscle movement called.

Explain how thermal energy is transferred through convection.

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?