What is the difference between a group and a period

1 answer:

5 0

Periods going left to right. The periodic table also has a special name for its vertical columns. Each column is called a group. The elements in eachgroup have the same number of electrons in the outer orbital.

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How do you add scientific notation if the problem is like this: 3.72 x 10^9 + 5.46 x 10^8?

Crazy boy [7]

You can only add or subtract numbers in scientific notation if they have
the same power of 10. If they're different, then you have to change one
to match the other one.

Here are both ways to do your example:

3.72x 10^9 = 37.2x10^8

(37.2 x 10^8)+(5.46 x 10^8) = (37.2+5.46) x 10^8 = 42.66x10^8 = 4.266x10^9

=======================

5.46 x 10^8 = 0.546 x 10^9

3.72 x 10^9 + 0.546 x 10^9 = (3.72 + 0.546) x 10^9 = 4.266 x 10^9

3 0

4 years ago

a measure has true value of 2.00and the measurement value was found to e 1.95.calculate the precision of the measuring instrumen

DiKsa [7]

The precision of the measuring instruments will be 2.5%.

<h3>What is precision?</h3>

It should be noted that precision simply means how close a test result will be when it's repeated.

In this case, the precision of the measuring instruments will be:

= (2 - 1.95)/2.

= 0.05/2

= 2.5%

Therefore, the the precision of the measuring instruments will be 2.5%.

Learn more about precision on:

brainly.com/question/5792909

8 0

2 years ago

Read 2 more answers

What nuclear reaction is the energy source of a white dwarf?

sammy [17]

Answer:

Multiple choice answer would be "None"

Explanation:

White dwarfs are radiating stored heat from earlier reactions.

Technically, it would be the last fusion stage the star went through

BEFORE it became a white dwarf, but that's nit-picking.

7 0

4 years ago

Study the graph above. What can you conclude about ticket prices and concert attendance, based on this data?

iren2701 [21]

Answer:When the tickets prices went up the attendance went down because people wanted cheaper prices not higher prices.

Explanation:I hope i have helped u have an wonderful day or night!

7 0

2 years ago

A plane takes off in san francisco at noon and flies toward the southeast. an hour later, it is 400 kilometers east and 300 kilo

eduard

This first step involves a right triangle. If the plane is 400 km east and 300 km south of the origin, and it flew in a straight line, then you can construct a right triangle with side lengths 300, 400, and c. You may recognize that these are multiples of the Pythagorean triple 3, 4, 5, so the side length c is 500 km. Otherwise, you would write
$c^2 = 300^2+400^2 \\ c = 500$ .

This second step is, if I am correctly interpreting "degrees south of east," to find the angle formed by the horizontal line representing the east and the path of the plane. I made a diagram that does just that (see attached). You can use a trig function of one of the angles to solve. I chose
$tan(C)= \frac{3}{4} \\ arctan( \frac{3}{4})=36.870$ . Thus, I believe it is 37° south of east.

5 0

3 years ago