Consult the periodic table. An electrically neutral atom has the following electron configuration: 1s22s22p63s23p4. What is the name of this atom?

nitrogen

calcium

boron

tin

Which element is a noble gas? (1) krypton (3) antimony (2) chlorine (4) manganese

The density of helium in a 2.00 L tank at 1.0 atm and 23 degrees Celsius is?

Both the freezing temperature and the melting temperature of water are the same (0°C). Explain why a substance like water freezes and melts at the same temperature.

What nuclear symbol and hyphen notation for the isotope which has 26 protons and 30 neutrons?

What are some behavioral adaptations for a porcupines?

Read the excerpt from a science text. In our experiment, we filled two identical glasses with water. To one glass, we added two tablespoons of salt and stirred. To the other glass, we added four drops of food coloring and stirred.

Carbon can double bond to some atoms to complete its octet. True or false?

What is caused by the heating and coolingof the earth

How do the particlesthat make up an atom interact

A chemistry student needs 55.0g of dimethyl sulfoxide for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of dimethyl sulfoxide is ·1.10gcm-3.