Question | Answer |
What do we call the elements in group 18? | Noble Gases |
Why are metalloids sometimes referred to as "semiconductors?" | Semiconductors can conduct electric current under some conditions, but not under other conditions |
What category in the periodic table have properties of both metals and nonmetals? | metalloids |
What is the chemical symbol for potassium? | K |
How many letters can a chemical symbol have? | 1 or 2 |
Are groups horizontal or vertical? | vertical |
Which category on the periodic table is the biggest? (metals, nonmetals, metalloids) | Metals |
How do atoms combine to form compounds? | gain, lose, or share electrons |
What do we call the electrons in the outermost energy level that have the highest amount of energy? | Valence Electons |
What do we call the symbol of an element surrounded by dots that represent valence electrons? | Electron dot diagram |
What is the force of attraction that holds atoms together as a result of the rearrangement of electrons between them? | Chemical Bond |
How did Mendeleev arrange his periodic table? | Increasing atomic mass |
What means "in a regular, repeated pattern?" | periodic |
How is the modern periodic table arranged? | In order of increasing atomic number |
The following are properties of ____________. Poor conductors of heat and electricity, dull, brittle | nonmetals |
Elements are classified according to ________________. | their properties |
Name some physical properties of metals. | malleable, ductile, good conductors of heat and electricity |
What is the smallest particle that can still be an element? | atom |
What is a negatively charged particle called? | electron |
What is a positively charged particle | proton |
Where are electrons found? | Electron cloud |
What subatomic particle has no charge? | neutron |
The number of protons in the nucleus of an atom is the __________________. | atomic number |
If two atoms have the same number of protons, but different numbers of neutrons are known as _______________. | isotopes |
What is a column on the periodic table called? | Group |
What is a row on the periodic table called? | Period |
How can the properties of an element be predicted? | From its location on the periodic table |
Would elements in the same period or the same group have similar characteristics? | Same group |
Where are the alkaline earth metals located on the periodic table? | Group 2 |
What group of metals are the most reactive | Alkali Metals |
What category of elements are poor conductors of electric current and heat? | nonmetals |
What states that matter can neither be created or destroyed? | The law of conservation of mass |
When is the law of conservation of mass true? | ALWAYS--you just can't measure it in an open system because there is an exchange |
Tearing a piece of paper is an example of which type of change? | physical |
Changes of state (ex. melting) are which type of change? | physical |
Burning is and example of which type of change? | chemical |
Which type of reaction absorbs heat? | endothermic |
Which type of reaction releases heat | exothermic |
What do we call the elements/compounds located on the left side of a chemical equation? | reactants |
What do we call the elements/compounds located on the right side of a chemical equation? | products |
Which type of reaction would show reactant breaking down into 2 or more products? | decomposition |
Which type of reaction would show 2 or more reactants forming one product? | synthesis |
What is the chemical symbol for magnesium? | Mg |
What is the best evidence a chemical reaction has occurred? | One or more new substances are formed |
If Calcium is in group 2, how many valence electrons will it have? | 2 |