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2 years ago

On a time quizzed please help

Mathematics

2 answers:

zhuklara [117]2 years ago

4 0

Answer:

Element Valence electrons

Nitrogen 5

Silicon 4

Oxygen 6

Magnesium 2

Explanation :

Valence electrons : Valence electrons are the electrons which is present on the outermost shell of the electron.

The given element is nitrogen that belongs to group 15 and the atomic number 7.

The number of electrons present on nitrogen element are 7.

The electronic configuration of nitrogen element is,

The number of valence electrons present on nitrogen element are, 5.

The given element is silicon that belongs to group 14 and the atomic number 14.

The number of electrons present on silicon element are 14.

The electronic configuration of silicon element is,

The number of valence electrons present on silicon element are, 4.

The given element is oxygen that belongs to group 16 and the atomic number 8.

The number of electrons present on oxygen element are 8.

The electronic configuration of oxygen element is,

The number of valence electrons present on oxygen element are, 6.

The given element is magnesium that belongs to group 2 and the atomic number 12.

The number of electrons present on magnesium element are 12.

The electronic configuration of magnesium element is,

The number of valence electrons present on magnesium element are, 2.

Step-by-step explanation:

shutvik [7]2 years ago

3 0

Answer:

Nitrogen has 5, Silicon has 4, Oxygen has 6, Magnesium has 2

Step-by-step explanation:

You will need a periodic table to figure this out. You will notice that at the top of each group that there are numbers from 1 to 18. The last number of each group is the valence electrons. This doesn't work for transition metals though. So for example if you look at where Nitrogen is located, it is underneath the 15 so there are 5 valence electrons. Valence Electrons is the most outer part of the electrons. There can only be a total of 8 electrons in each ring. Silicon is located in the 14 row (group) so there are 4 valence electrons. Oxygen is in the 16th so there are 6. And magnesium is in the 2nd group, so there are 2 valence electrons. This only works for groups 1, 2, 13, 14, 15, 16, 17, and 18. The transition metals in the middle do not go with this rule. Hope this helped out.

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To approximate the length of a lake, a surveyor starts at one end of the lake and walks 245 yards. He then turns 110 and walks 2

kolezko [41]

Answer:

Surveying To approximate the length of a marsh, a surveyor walks 250 meters from point to point , then turns and walks 220 meters to point (see figure). Approximate the length of the marsh.

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Step-by-step explanation:

8 0

2 years ago

Bill's recipe for onion soup call for 4.0lb of thinly sliced onions. If an onion has an average mass of 115g, how many onions do

musickatia [10]

Answer:

1. $16\ onions$

2. $4,040.91\ kg$

Step-by-step explanation:

1. You know that the average mass of an onion is 115 grams and Bill needs 4.0 pounds.

Then, since $1\ lb=453.592\ g$ , we can make the following conversion:

$(4.0\ lb)(\frac{453.592\ g}{1\ lb})=1,814.37\ g$

Then, the number of onions Bill needs is:

$(1,814.37\ g)(\frac{1\ onion}{115\ g})=15.77\ onions$ ≈ $16\ onions$

2. Since $1\ kg=2.20462\ lb$ , we can make the following conversion:

$(11\ lb)(\frac{1\ kg}{2.20462\ lb})=4.98\ kg$

Knowing that all the potatoes sold today at the store bring in $1,420 and 4.98 kilograms of potatoes is $1.75, we can calculate the amount of kilograms the grocery shoppers bought:

$(\$1,420)(\frac{4.98\ kg}{\$1.75})=4,040.91\ kg$