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
icang [17]
3 years ago
15

Please help! 30 points! ASAP plz and correct answers only please!!

Mathematics
2 answers:
Rasek [7]3 years ago
4 0

Answer: NA and Rb and there are 20 protons in calcium!

Step-by-step explanation:

ki77a [65]3 years ago
3 0

Answer:

No. of protons = 20

No. of electrons = 20

No. of neutrons = 20

Step-by-step explanation:

Part 1 :

Na, K and Rb are in the same group.

So, K and Rb are the two elements that have the same properties as sodium ( Na ).

Part 2 :

Atomic Number of Calcium = 20

Note :

Atomic Number = No. of protons

Therefore,

No. of protons = 20

Note :

No. of neutrons = No. of protons.

Therefore,

No. of neutrons = 20

Calcium is the 20th element, with 20 protons. Since a stable atom has a net charge of 0, it must have 20 electrons.

You might be interested in
Barb solved the following equation: 4(3x – 12) = 5(2x + 6)
katrin2010 [14]

Answer:

4(3 * 39 – 12) = 5(2 * 39 + 6)

x = 39


Step-by-step explanation:

4(3x – 12) = 5(2x + 6)

(12x - 48) = (10x + 30)

12x - 10x = 30 + 48

2x = 78

2x/2 = x

78/2 = 39

x = 39

No Prob :)

5 0
3 years ago
Read 2 more answers
Which of the following is the solution to: -3x + 8 < 14
Mariana [72]

Answer:

The correct solution is C (x> -2)

3 0
2 years ago
Martina starting playing video games as soon as she got home from school. She played video games for 15 minutes. Then Martina he
VLD [36.1K]

Answer:

3:30PM

Step-by-step explanation:

Martina starting playing video games as soon as she got home from school. She played video games for 15 minutes. Then Martina helped clean the kitchen for 45 minutes. After the kitchen was clean, it took Martina 15 minutes to finish her homework. When Martina finished her homework, it was 4:45 P.M. What time did Martina get home from school?

Step 1

We add up the minutes it took her to do things

= Minutes for video games + Minutes for cleaning the kitchen + Minutes for doing homework

= 15 minutes + 45 minutes + 15 minutes

= 75 minutes

= 1 hour 15 minutes

Step 2

When Martina finished her homework, it was 4:45 P.M. What time did Martina get home from school?

This is calculated be subtracting 1 hour 15 minutes from 4:45 PM

= 4:45 PM - 1 : 15

= 3:30PM

Therefore, Martha got home from school by 3:30 PM

3 0
3 years ago
Which expression is equivalent to 63 + 27?
azamat
The answer would be B.
5 0
3 years ago
Given: AB with coordinates of AC-3, -1) and B(2, 1)
andrezito [222]

Answer:

up 2, right 3

Step-by-step explanation:

up 2, to the right 3.

8 0
3 years ago
Other questions:
  • Howard planted 20 trees in 4 days. Janet planted 20 trees in 6 days. How long would it take them to plant 20 trees working toget
    11·1 answer
  • How much longer do the turkey need to cook
    5·2 answers
  • Shelby wants to buy three ice creams and some candy for her friends. Shelby wants to spend exactly $16.50. If ice creams cost $3
    10·2 answers
  • Rashad has 25 stamps. he shared them equally among himself and four friends. then rashad found two more in pocket. what is the e
    12·2 answers
  • If 34 percent of 60 million barrels is gasoline and 29 percent of 60 million barrels is desil how many more barrels are there of
    15·2 answers
  • I need some help with this math problem. I've had it explained to me two different ways. If x= -3 then what would be the answer
    14·2 answers
  • What is the lowest common denominator of the following set of fractions: 1/6 , 13/27 , 4/5 , 3/10 , 2/5 ?
    12·1 answer
  • Mia wrote an equation to approximate the total number of calories in the strawberries she was eating. She used the equation y =
    8·2 answers
  • Six less than the product of 3 and a number is 12
    7·1 answer
  • The measures of the angles In alinear pair are x degree and (x+25) degree. Find the measures of each of them
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!