Question

directions: fill in the blank with the correct word from the list at the bottom of the page. not all words from the list will be used. 1. atomic ______ refers to the arrangement and number of smaller particles in an atom. 2. the ____ is the center or core of an atom. 3. ____ are positively charged particles located in the nucleus. 4. neutrons have a ____ charge. 5. ____ are atoms of the same element with different numbers of neutrons. 6. ____ are subatomic particles with a negative charge. 7. the sum weight of protons and neutrons in an atom is its atomic ____. 8. elements in the periodic table are ordered according to their atomic ____. 9. ____ are the most common elements on the periodic table. 10. elements in the family called the alkaline earth metals are very ______. electron cloud electrons isotopes mass units metalloids metals neutral neutron nucleus protons reactive structure

Explanation:

1. Atomic structure describes the arrangement of sub - atomic particles in an atom.
2. The nucleus is the central part of an atom.
3. Protons are positively charged and in the nucleus.
4. Neutrons have no charge (neutral).
5. Isotopes are atoms of the same element with different neutron numbers.
6. Electrons are negatively charged sub - atomic particles.
7. The sum of protons and neutrons gives atomic mass.
8. Elements in the Periodic Table are ordered by atomic number.
9. Metals are the most common elements in the Periodic Table.
10. Alkaline earth metals are very reactive.

Answer:

1. Isotopes
2. Electrons
3. mass
4. number
5. Metals
6. reactive