Please help me understand this "Drag and drop each element symbol to its correct location on the dichotomous key". Symbols

Br Li As Ca Sb Mg Mn V Na K Sc I S Y

1. Conductors (Yes) : Li, Ca, Mg, Mn, V, Sc, Y, Na, K

a) Energy level 2 = Li

b) Energy level 3: Na, Mg

b. (i) One valence electron = Na

b. (ii) Two valence electrons = Mg

2. Conductors (No) : Br, I, S, As, Sb

a) Energy level 3 = S

b) Energy level 4: Br, As

b. (i) Seven valence electrons = Br

b. (ii)Five valence electrons = As

Explanation:

Conductors are elements which are able to conduct heat and electricity easily. They are usually metallic elements.

From the list of elements, the metals are: Li, Ca, Mg, Mn, V, Sc, Y, Na, K.

From the list of conductors, Li alone has the energy level of 2.

Na and Mg both have energy level of 3 but Na has one valence electron while Mg has two.

Non-conductors or poor conductors do not allow either heat or electricity to pass through them easily. They are usually the non-metals and semimetals or metalloids.

From the list of elements, the poor conductors are: Br, I, S, As, Sb

Only the element S, has an energy level of 3. Both Br and As have energy levels of 4 each. However, Br has seven valence electrons while As has five valence electrons.

The elements identified can be used to fill the dichotomous key attached below.

it's c. elements are placed in rows based on how may valencies electrons have.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)