What is the mass of an atom with 19 protons and 20 neutrons?

Two alkaline earth metals are

Which of the following represents an atom of calcium?

Which element has 6 protons?

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.

All elements are composed of extremely small particles called

Erica and Jim are given a closed container of ice. They find the mass of 28.0 grams. The container of ice is left on the lab table overnight. The next day, Erica and Jim found that all of the ice had melted. What would the mass of the container be?

A mixture of baking soda is prepared in water. The mass of this mixture is 225g. The original mass of baking soda was 50g. What is the original mass of water to which the baking soda was added?

A balloon is filled with water. The balloon is heated and begins to expand. The water inside begins to turn into steam. What will happen to the mass of the balloon?

Which combination of elements represents part of a group, or family, of the periodic table?(Hint: Find the group of elements that are in the same family.)

Fluorine, chlorine, bromine, and iodine are part of a family called

Which subatomic particles have a positive charge?

Which subatomic particles have a negative charge?

The periodic table family that contains the most elements is the

Chlorine is the atomic number 17 in the periodic table of elements. What information below is true about the element chlorine?

Based on your knowledge of atoms, what do you know about the atomic structure of aluminum? All but one statement is true. Select the FALSE statement.

The element fluorine has ________ protons in its nucleus. Fluorine also has a total of ____ electron shells. Fluorine is a member of the __________ family.

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