>> Activity 4 Test yourself Cognitive levels 1-2
Building a Periodic Table
1 Use the clues to place the symbols in the table below.
A: the most reactive metal in this list
B: a non-metal that can make four bonds
C: a yellow solid that is a non-metal
D: a noble gas with two protons
E the lightest alkali metal
F: a member of the alkali earth metals with 12 neutrons
G: a metalloid in Group 13
H: gas in Period 2 that is used in combustion reactions
1: a semiconductor in Period 3
J: a noble gas with the configuration 152 252 2p 3s 3p
K: the most common gas in the atmosphere with five valence electrons
L: a halogen in Period 3
M: a yellowish gas that forms an ion with a -1 charge
N: a light, silvery metal with a valency of 3
0: an element with 4 protons
P: an element with the smallest atoms
Q: an element with the notation 'Q
R: a gas used in street-lights and lighted signboards
2 Write the correct chemical symbol for A-Rin Question 1.​

What can be found in every skeletal muscle? a. nerves, bones, cartilage, and connective tissue b. tendons, cartilage, nerves, and blood vessels c. muscle fibers, nerves, connective tissue, and blood vessels d. tendons, nerves, blood vessels, and bones

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

=force × distance a. work b. velocity c. pressure d. momentum