Atoms and the periodic table

In summary: So in summary, if 2 protons are removed from an oxygen-16 atom, it becomes carbon-14. The approximate atomic mass of an atom with 43 electrons, 56 neutrons, and 43 protons is approximately 99 and the element is Technetium. An electrically neutral iron atom has 26 electrons and the existence of neutrons was not discovered until later as they have no electrical charge. The atomic masses listed in the periodic table are not whole numbers because they are averaged.
  • #1
likewhoa
5
0

Homework Statement


1.If protons and two neutrons are removed from the nucleus of an oxygen-16 atom, a nucleus of which element remains? electron
2. If an atom has 43 electrons, 56 neutrons and 43 protons what is its approximate atoms mass? What is the name of this element? Technetium, 99
3. The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron have? 26
4. Evidence for the existence of neutrons did not come until many years after discoveries of the electrons and protons. Give possible explanation. It has no electrical charge.
5. Why are the atomic masses listed in the periodic table not whole numbers? The atomic masses are averaged.



Hello I was wondering if someone can double check my answers thanks!
 
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  • #2
likewhoa said:

Homework Statement


1.If protons and two neutrons are removed from the nucleus of an oxygen-16 atom, a nucleus of which element remains? electron
2. If an atom has 43 electrons, 56 neutrons and 43 protons what is its approximate atoms mass? What is the name of this element? Technetium, 99
3. The nucleus of an electrically neutral iron atom contains 26 protons. How many electrons does this iron have? 26
4. Evidence for the existence of neutrons did not come until many years after discoveries of the electrons and protons. Give possible explanation. It has no electrical charge.
5. Why are the atomic masses listed in the periodic table not whole numbers? The atomic masses are averaged.
Hello I was wondering if someone can double check my answers thanks!
1. If you remove protons you change the atom or element, it's asking what element you get. But how many protons are being removed? It just says protons.

2. correct
3. correct
4. correct and it's in the nucleus so it doesn't interact with other atoms like electrons do
5. correct
 
  • #3
sorry about that 2 protons are being removed. Would it be carbon?
 
  • #4
likewhoa said:
sorry about that 2 protons are being removed. Would it be carbon?

yeah, specifically carbon-14
 

1. What is an atom?

An atom is the basic unit of matter. It is the smallest particle of an element that retains the properties of that element. Atoms are made up of a nucleus, which contains protons and neutrons, and electrons orbiting around the nucleus.

2. How many elements are there on the periodic table?

There are currently 118 known elements on the periodic table. These elements are organized by their atomic number, which is the number of protons in the nucleus of an atom.

3. What is the periodic table used for?

The periodic table is used to organize and classify elements based on their properties. It allows scientists to easily see patterns and trends among elements, such as their atomic structure, reactivity, and physical and chemical properties.

4. What is an element's atomic mass?

An element's atomic mass is the average mass of all the isotopes of that element. Isotopes are atoms of the same element that have a different number of neutrons in their nucleus.

5. How are elements arranged on the periodic table?

Elements are arranged on the periodic table in order of increasing atomic number from left to right and top to bottom. This arrangement is known as the periodic law, which states that elements with similar properties occur at regular intervals.

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