An atom has atomic number 11 and mass number 23. How many electrons does the atom have?

The electron configuration for an atom is 1s 2s 2p2. How many electrons does the atom have? 2 4 5 6

Dustin saw the following moon phase in the sky. What moon phase will he most likely see in 14 days? A. a first-quarter moon B. a new moon C. a last quarter moon D. a full moon Reset Submit

Uranium-238 decays very slowly. its half-life is 4.47 billion years. What percentage of a sample of Uranium-238 will remain after 13.4 billion years? i have to test after 3 days!

What keeps some of the radiation from the sun in the atmosphere?

A molecule of any organic compound has at least one 1. ionic bond 2. double bond 3. oxygen atom 4. carbon atom

How do you explain the relativity high conductivity of tap water compared to a low or zero conductivity for distilled water

According to Newtons's first law, which characteristic of a moving object would remain constant if there were no other force of acting of it? A. Size B. Mass C. Shape D. Speed

Standard reduction potentials are 1.455 V for the PbO2 (s) / Pb (s) couple, 1.82 V for Co3 (aq) / Co2 (aq), 3.06 V for F2 (g) / HF (aq), 1.07 V for Br2 (l) / Br - (aq), and 1.77 V for H2O2 (aq) / H2O (l).

Which compound is inorganic? a. glucose (c6hl2o6) b. carbon dioxide (co2) c. ethane (c2h6) d. stearic acid (cl8h36o2) ?

Pure aluminum metal has a density of 2.70 g/cm