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Took me a while to find but you can spot it eventually.

It's Argon (Ar) and Potassium (K).

Hope this helps :)

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Q: State which two elements from the first 20 elements of the modern periodic table are not arranged in order of increasing atomic mass?
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Related questions

When the elements are arranged by increasing atomic number there will be a periodic repetition of their prop?

The periodic law states that when the elements are arranged by increasing atomic number, there will be periodic repetition.


In the periodic table the elements are arranged in order of increasing?

In modern periodic table, elements are listed by increasing atomic number.


How did Mendeleev arrange chemical elements?

He arranged the elements in the increasing order of their atomic masses and repeating periodic properties.


Mendeleev arranged the elements in his periodic table in order of?

Mendeleev arranged the elements by increasing atomic mass instead of like today by increasing atomic number.


What are some ways that elements are arranged on the periodic table of elements?

Mendeleev arranged the elements in a table in the increasing order of atomic masses and repeating periodic properties. In the modern long-form of periodic table, the elements are arranged in the increasing order of atomic number and repeating periodic properties.


Are the elements on a periodic table arranged in order of decreasing atomic mass?

No. The elements are arranged in order of increasing atomic number.


How are the elements in the first periodic table arranged?

In the first Periodic Table by Mendeleev, he arranged the elements in the increasing order of their atomic masses and repeating properties.


How did he arrange similar elements on the periodic table?

In Mendeleev's periodic table the elements are arranged in increasing atomic mass and repeating properties whereas in in the modern periodic table the elements are arranged in increasing atomic number and repeating properties.


How are the elements on a Periodic Tables arranged?

The elements are arranged in the increasing order of their atomic number and repeating properties.


What is the modern periodic table is now arranged according to?

Now modern periodic table is arranged in order of increasing atomic number. The properties are found to be periodic when arranged in this pattern.


What does the atomic number and atomic mass have to do with the arrangement of the elements on the periodic table?

The elements on the periodic table are arranged in order of increasing atomic number.


The Modern Periodic Law states that there will be a periodic repetition of properties when the elements are arranged according to increasing atomic what?

Increasing atomic number.