Which of the following elements has two (2) valence electrons?

A. Na

B. Mg

C. Al

D. S

A block of aluminum occupies a volume of 15.0 ML and weighs 40.5 gallons what is the density

In one experiment, magnesium metal melts. In a second experiment, magnesium metal ignites as it combines with oxygen. Classify the change in each experiment as chemical or physical. Explain your reasoning.

If an atom has three protons three neutrons and two electrons what is the electrical charge of the atom

which factor is the most common source of erosion in the high elevation of the swiss alps A. liquid water B. glaciers C. wind D. plants

Where is copper in the periodic table?

Could acetic acid be used in the esterification, instead of acetyl chloride? Why or why not?

9. In a sample of gas, what causes pressure? Answer in a completesentence.

Sodium (Na) reacts with chlorine gas (Cl2 ) to form sodium chloride (NaCl) as shown in the equation: 2Na + Cl2 → 2NaCl If 4 moles of chlorine gas react, how many moles of sodium will react?

What are transuranium elements properties?

A geologist finds a section of rock that shows was ripple marks. What does it he pr send me or a ripple marks say about the area where the rock formed? A. the rock from rk s in a fast moving stream B.