Question | Answer |
what is the study of matter? | chemistry. |
What is the smallest piece of an element. | an atom. |
what is the center of an atom? | The nucleus. |
what is a positively charged particle? | a proton |
What is a nuetrally charged partical? | A nuetron. |
What is a negatively charged particle? | an electron. |
they travel around what in a random order? | the nucleus |
protons and nuetron are the heaviest or lightest part of the atom? | Heaviest. |
What is the approximate number of protons and nuetrons in an atom? | the atomic mass. |
Protons and electrons are always equal, so there is no overall -----? | charge. |
the average distance away from the nucleus at which electrons can travel around is called what? | a shell. |
how many protons are there in the first shell? | 2 protons. |
how many protons are in the 2nd shell? | 8 protons. |
how many protons are in the 3rd shell? | 18. |
Each shell is able to hold a certain number of what depending on its distance from the nucleus. | Electrons |
What is the number of protons in a nucleus? | Atomic number |
What do scientist think about atoms, because no one has seen an atom because they are too small? | Atomic theory |
The atomic theory was devised by who? | niels bohr |
an atom has the same number of protons as what? | electrons |
what is a substance that contains only one kind of atom? | an element |
What is an abbreviation for the names of symbols? | the Chemical symbol |
chemical symbols are based on two languages. What are they? | English and latin |
What is the periodic table of elements? | It is the classification system that organizes elements based on atomic numbers and groups them into rows and columns based on the chemical and physical properties. |
Who was the periodic table of elements founded by? | demitri mendeleev |
Each square has three pieces of information. What are they? | The chemical symbol, the element name, and the atomic number. |
What are the horizontal rows that all have the same number of shells? | Periods |
What are groups? | The vertical columns that have the same number of electrons in their outer shell. |
What is hte group elements that possess similar chemical properties and reacts similarly with other elements? | Families |
What do families consist of? | they are color coded, alkali metals are the first 2 columns on the left, there are metals, semi-metals ( also known as metalloids), and non-metals (gas). |
What do elements in a group have in common? | They have similar physical and chemical properties. |
What are atoms held together by chemical forces? | Molecules |