Which of the following best describes a change in iron caused by a chemical reaction?

Madeline spilled hydrochloric acid on the lab table. She sprinles baking soda on the spill to help clean up the spill. Which evidence of a chemical change did she observe?

Group number determines..

Identity of the element determined by

Charge of the nucleus

atomic mass is determined by

Flourine is in group 17 and has an atomic number of 9. How may valence electrons does it have?

Element in group 2 of the periodic table has how many valence electrons?

Flourine, Chlorine, Bromine and Iodine are all found in the same group. These elements are group together because

Which explains why Noble gases do not react with other elements?

An atom has 24 protons, 28 neutrons and 24 electrons. What's the charge of the nucleus?

Which information on the periodic table gives you the number of protons of the element?

Which of the following best describes an electron?

Which group of elements are most reactive?

An atom has 10 protons and atomic mass of 20. How many electrons

An atom has 10 protons and atomic mass of 20. How many neutrons?

An atom has 3 protons and 4 neutrons. How many electrons?

An atom has 3 protons and 4 neutrons. What's the mass number?

An atom has 5 electrons and 6 neutrons. What's the atomic number?

An atom has 5 electrons and 6 neutrons. What's the atomic mass?

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