1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Alexus [3.1K]
3 years ago
9

Please help guys!!! Points + Brainliest

Mathematics
2 answers:
Bas_tet [7]3 years ago
8 0
Protons and electrons are 12. For neutrons, there are 12 of them. 
<span>Magnesium has an </span>atomic number<span> of 12, which means there are 12 protons.
You subtract the atomic number from the mass number in order to find neutrons.
</span>Atomic mass is 24. 24-12=12
Electrons always match the number of protons.
Ipatiy [6.2K]3 years ago
5 0

Answer:

Part 2:

There are 19 protons in the element K, you can tell because of the number 19 above the elements abbreviation. There are also 19 electrons in this element, you can tell because the number of protons is the same number of electrons. Last, to find the number of neutrons an atom possesses, you have to round the atomic mass ( 39.089 to 39 ). Then you take your Mass number ( 39 ) and subtract it from your number of protons (19). 39 - 19 = 29, there are 29 neutrons in the element K.

Hope that this helps! :)

Also if you need part 1 :)

Part 1:

The two-element that has the same properties as Magnesium are Calcium (Ca) and Strontium (Sr). These three elements are all Alkaline earth metals, they are not as reactive as Alkali metals but they are too reactive to be found in nature.

You might be interested in
Help me plssssssss!!!!!!!
ExtremeBDS [4]

Answer:

44 degrees

Step-by-step explanation:

there's two ways u could do this. One is all triangles add up to 180 degrees. u simply ignore the outside angle of 136 degrees, and add 62 and 74, and u get 136. take 180-136, and u get 44.

Another way is all strait angles add up to 180 degrees. take 180-136, and u get 44 degrees

Hope this helps and have a nice day :) :) :)

8 0
3 years ago
A bacteria population is growing exponentially with a
Ad libitum [116K]
Population change is 4/3
4 0
2 years ago
Lily bought 6 skirts and 5 coats for a total of $452.62. If Lily's
PSYCHO15rus [73]

Let x = cost of one skirt

Let y = cost of one coat.

We need to construct a system of equations to help us solve this problem.

Lily: $452.62 = 6x + 5y

Sis: $289.36 = 3x + 5y.

Let's solve this by elimination. Multiply the second equation by -1

Lily: $452.62 = 6x + 5y

Sis: -$289.36 = -3x + -5y. Add the equations together.

$163.26 = 3x. Divide each side by 3.

$54.42 = x. Plug this into one of our original equations.

$452.62 = 6(54.42) + 5y. Multiply 6 by 54.42

$452.62 = 326.52 + 5y. Subtract 326.52 from each side.

$126.1 = 5y. Divide each side by 5

$25.22 = y.

One coat costs $25.22

5 0
3 years ago
How many times larger is a kilometer than a meter
love history [14]

Answer:

1000 times

Step-by-step explanation:

Kilo- means one thousand. By this we know that 1 meter = 1000 kilometers.

Attached is a helpful prefix chart--memorizing it may come in handy.

3 0
2 years ago
Given two independent random samples with the following results: n1=8x‾1=186s1=33 n2=7x‾2=171s2=23 Use this data to find the 90%
KonstantinChe [14]

Answer:

The point of estimate for the true difference would be:

186-171= 15

And the confidence interval is given by:

(186-171) -1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= -10.753

(186-171) +1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= 40.753

Step-by-step explanation:

For this case we have the following info given:

\bar X_1 = 186 the sample mean for the first sample

\bar X_2 = 171 the sample mean for the second sample

s_1 =33 the sample deviation for the first sample

s_2 =23 the sample deviation for the second sample

n_1 = 8 the sample size for the first group

n_2 = 7 the sample size for the second group

The confidence interval for the true difference is given by:

(\bar X_1 -\bar X_2) \pm t_{\alpha/2}\sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}

We can find the degrees of freedom are given:

df = n_1 +n_2 -2 =8+7-2= 13

The confidence level is given by 90% so then the significance would be \alpha=1-0.9=0.1 and \alpha/2=0.05 we can find the critical value with the degrees of freedom given and we got:

t_{\alpha/2}= \pm 1.77

The point of estimate for the true difference would be:

186-171= 15

And replacing into the formula for the confidence interval we got:

(186-171) -1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= -10.753

(186-171) +1.77 \sqrt{\frac{33^2}{8} +\frac{23^2}{7}}= 40.753

5 0
3 years ago
Other questions:
  • Please help me! :( Will mark as brainliest !!
    11·1 answer
  • Pleaseee help. Oh yeah this has to be 20 characters soooo
    8·2 answers
  • The number of surface flaws in plastic panels used in the interior of automobiles has a Poisson distribution with a mean of 0.04
    10·1 answer
  • Consider a game in which a participant pays $2 to roll a die. The participant receives $3 if they roll a 1 (i.E. They go up by a
    12·1 answer
  • 3m-n=km-8, solve for m
    8·2 answers
  • Please help me with these questions
    5·1 answer
  • On the unit circle, which of the following angles has the terminal point coordinates (√2/2,-√2/2)
    5·1 answer
  • To the nearest foot, what is the radius of the Ferris wheel if you traveled 157 feet? feet
    5·2 answers
  • Identify the correct equation for the graph below.
    15·1 answer
  • Line has equation 3x + y = 15<br><br> Find the gradient of the line.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!