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4 years ago

Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to

2 answers:

4 0

In the periodic table, the group number or elements belonging to the same column are elements with the same charge relating to the number of valence electrons which can react with other atoms in their outside shells. In this case, the positive charges pertain to B. group number.

Ymorist [56]4 years ago

4 0

Answer: The group number.

The group number in the modern periodic table shows the number of valence electrons (or ions) in the outermost shell of an atom. [The valency is the number of electrons present in the outermost shell that is needed to be eliminated or added from outermost shell of an atom to complete its octate. It is defined for atoms for neutral charges while charge (ions) is defined for charged species].

Therefore, Alkali metals, alkaline earth metals, and aluminum all form ions with positive charges equal to the group number.

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3 years ago

a packe of cards conatins 4 red and 5 black cards. a hand of 5 cards is drawn without replacment. What is the proablity of all f

Vladimir79 [104]

Answer: Our required probability is 0.3387.

Step-by-step explanation:

Since we have given that

Number of red cards = 4

Number of black cards = 5

Number of cards drawn = 5

We need to find the probability of getting exactly three black cards.

Probability of getting a black card = $\dfrac{5}{9}$

Probability of getting a red card = $\dfrac{4}{9}$

So, using "Binomial distribution", let X be the number of black cards:

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Hence, our required probability is 0.3387.

5 0

3 years ago

A rectangle has a width of 46 centimeters and a perimeter of 204 centimeters. What is the rectangle’s length?

Vanyuwa [196]

Answer:

Length = 56

Step-by-step explanation:

Perimeter = Length + Length + Width + Width

Perimeter = 2L + 2W

2L + 2W = 204

2L + 2(46) = 204

2L + 92 = 204

Subtract 92 from both sides

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7 0

4 years ago

Write the quadratic equation in general form. (x - 3)^ 2 = 0

algol [13]

The answer is: x² – 6x + 9 = 0 .
_____________________________________________________
Explanation:
________________________________________________________

Given: (x – 3)² = 0 ; write as: general form: "ax² + bx + c = 0"; a ≠ 0 .
<span>
Note: </span>(x – 3)² = (x – 3)(x – 3) = x² – 3x – 3x + 9 = x² – 6x + 9 ;
___________________________________________________
Rewrite: (x – 3)² = 0 ; →
as: x² – 6x + 9 = 0 ; which is our answer.
____________________________________________
→ x² – 6x + 9 = 0 ; is in "general form", or "standard equation format"; that is: " ax² + bx + c = 0 "; (a ≠ 0) ;
→ in which:
a = 1 (implied coefficient, since anything multiplied by "1" is that same value);
b = -6;
c = 9
_______________________________________________________

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3 years ago

Read 2 more answers

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snow_lady [41]

Answer:

45 divided by 3 equal 15

Step-by-step explanation:

45 Divided by 3 equal 15

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3 years ago