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Molodets [167]
3 years ago
9

Which element is the total number of valence electrons in an atom with a total of 13 protons

Chemistry
1 answer:
Musya8 [376]3 years ago
6 0

Answer:

This is Aluminium.

3 Valency electrons.

Explanation:

The atomic number is 13 and the electronic configuration is

1s22s22p63s23p1  . This is Aluminium.

It has 3 valency electrons.  (3s23p1).

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Ghella [55]
Energy, kinetic, potential
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3 years ago
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21. an atom has 216 protons, how many electrons does it have?
yanalaym [24]

Answer:

21: 47 22: 14

Explanation:

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Homework 1
Bond [772]

Answer:

average for silk =141"

average for cotton =96"

average for nylon = 70"

if you desire a slower falling parachute to protect the body from damage,

silk is the best

if you desire a faster falling parachute to escape enemy bullets,

nylon is the best

Explanation:

Homework 1

Problem Solving

1. Kelvin and Xavier were doing an investigation on parachutes. One of them suggested that the type of material the parachute was made from had an effect on how long it took to reach the ground. Their results are given in

the table below.

(a) Calculate the average time in seconds for each material.

Time taken for parachute to reach the ground (seconds)

MATERIAL

1st TRY

2nd TRY

3rd TRY

AVERAGE

Sik

144

140  average of 3 = 141

139

Cotton

98

96   average of 3  = 96

94

Nylon

72

68    average of 3 = 70

70

5 0
2 years ago
وزن الملي مكافئ لحامض الخليك​
Natalka [10]

Answer:

hshssytdtctdyeheb

Explanation:

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3 0
3 years ago
Why do atoms form bonds or why do bonds form?
stiv31 [10]

Answer:

Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. A chemical bond is a force of attraction between atoms or ions

Explanation:

7 0
3 years ago
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