The electron configuration 1s^2 2s^2 2p^6 3s^2 describes the electrons of which element?

sodium

manganese

phosphorus

magnesium

What are some examples of density?

A model of an atom is shown above. The blue dots represent electrons, and the red dot represents the nucleus. This model accurately represents

What occurs in both fusion and fission reactions? (1) Small amounts of energy are converted into large amounts of matter. (2) Small amounts of matter are converted into large amounts of energy. (3) Heavy nuclei are split into lighter nuclei.

When you look under your plastic water bottle, there's a recycling sign with a number in it. What does it mean?

An ideal gas with MW = 30 is flowing at a steady rate through a circular pipe (cross-section area of 57.8 cm^2) at a temperature of 1.60 * 10^2 °C and pressure of 49.3 psig.

Why does the effective nuclear charge increase across a row of the periodic table?

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?