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Strike441 [17]
3 years ago
5

element x is a neutral element and has 39 protons. what element is it and how many electrons does it have? (use the periodic tab

le)
Chemistry
1 answer:
alisha [4.7K]3 years ago
4 0

The element itself is Yttrium, which is a transition metal and not that reactive. Since it has 39 protons it will also have 39 electrons.

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umka21 [38]

Answer:

the answer is A

Explanation:

physical changes does not change the property of matter.

7 0
1 year ago
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There are three isotopes of X element (X):
Nutka1998 [239]

Answer:

Average atomic mass = 17.5 amu.

Explanation:

Given data:

X-17 isotope = atomic mass17.2 amu, abundance:78.99%

X-18isotope =  atomic mass 18.1 amu, abundance 10.00%

X-19isotope = atomic mass:19.1 amu, abundance: 11.01%

Average atomic mass of X = ?

Solution:

Average atomic mass  = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass)  / 100

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Average atomic mass  = 1749.919 / 100

Average atomic mass = 17.5 amu.

8 0
2 years ago
Which of the following is an action-at-a-distance force? friction tension gravity air resistance
MissTica

Answer:

Action-at-a-Distance Forces. Frictional Force. Gravitational Force. Tension Force ... The force of gravity on earth is always equal to the weight of the object as ... The friction force is the force exerted by a surface as an object moves across it or ... The force of air resistance is often observed to oppose the motion of an object.

Explanation:

8 0
3 years ago
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Anna007 [38]

Answer:

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Explanation:

complete question is:

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3 0
2 years ago
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What is common to all elements in the same group on the periodic table? Their properties are very different.
Mrac [35]
Hello,

<span>B.They have the same number of valence electrons. </span>
7 0
3 years ago
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