One or the other
Freezing point, colour, state, and conductivity are examples of which type of property?
Physical property
Are groups/families on the periodic table vertical or horizontal?
vertical
If two substances have the same atomic number but different mass numbers, they are called
An isotope
Which of the following elements is a transition element? Cl, Na, Cu, or O
Cu
Which model shows full electron configuration?
Bohr-Rutherford
A substance's ability to change into other substances is an example of what?
Chemical property
What do groups/families on the periodic table have in common?
characteristics and reactivity
What is in the nucleus of the isotope potassium-40
19 protons and 21 neutrons
Chlorine is an example of what type of element: metal, metalloid, or non-metal?
Non-metal
Which model shows just valance electrons?
Lewis
Baking bread and digesting bread are examples of what type of change?
Chemical change
The periodic table is a classification of the elements in order of increasing number of: protons or neutrons or electrons?
protons
How do nuclear reactions differ from chemical reactions?
Nuclear reactions involve large amounts of energy, new atoms are formed (nuclei change and the number of protons change).
What group number does Mg belong to?
2
How many valence electrons are characteristic of the Group 14 elements?
Four
What type of change is a rotting apple?
Chemical change
What happens when you move down the periodic table by one period?
You increase by one energy level
What does the term half-life mean?
The time it takes for half of the radioactive nuclei in a sample to decay to a more stable state.
What is the mass number of sodium?
23
Draw a Bohr diagram for the element with the atomic number 9
9P, 10N
9E - 2/7
Boiling and evaporating are examples of what type of change?
Physical Change
What is group 18 on the periodic table?
What type of radioactivity can penetrate our skin: Alpha, beta, or gamma?
Gamma
Name all the elements in the first 20 that have the same number of protons?
None! They all have a different number of protons! Atomic number = # of protons
Based on the Lewis dot structures, how many dots would the element with the atomic number 7 have?
Nitrogen - in group 15. 5 dots represent the valence electrons.