Use the portion of the periodic table shown below to answer the questions. sodium
11
magnesium
12
Na
Mg
22.990
potassium
19
24.305
calcium
20
scandium
21
K
Ca Sc
39.098
rubidium
37
40.078
strontium
38
44.956
yttrium
39
Rb
SrY
85.468
87 62
88.906
Part 1: Name two elements that have the same properties as sodium (Na) (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of calcium (Ca). Explain how you determined your answer using
complete sentences. (6 points)

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

Which best represents the law of conservation of mass ?

Give your knowledge of these things in your paper, you will compare and contrast analog and digital signals to determine which is more reliable for encoding and transmitting information. you’ll compare these features: signal shape numerical values for signal measurements amount of data that can be transmitted energy requirements privacy and security (ability of the signal to be encoded in a secret code) clarity of signal in the space provided, write down what you already know about any of these features. if you’re not sure, write down questions you might have about the features.