In an individual element's square, the top number is the atomic number, or the number of protons. The letter(s) are the symbol, and the number on the bottom is the atomic weight. Hope this helps.
Answer:
Xenon
Explanation:
The core electrons of an element are the electrons that do not take part in the chemical reactions of the element
The electronic configuration of barium Ba is presented as follows;
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²
2+2+6+2+6+2+10+6+2+10+6
The valence electrons of boron are the 6s² electrons
The core electrons of boron are the; 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶
The electronic configuration of xenon, Xe, which is the previous noble element before barium, is presented as follows;
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ which is the same as the core electrons of barium
Therefore, the total number of electrons in xenon is equal to the number of core electrons in barium
The similarity between first quarter moon and third quarter moon, is the moon is located perpendicular to Earth and the sun.
<h3>What is first quarter moon?</h3>
The first quarter moon is a primary moon phase when half of the moon's face is lit up.
The first quarter moon rises around midday and is visible in the day sky.
<h3>What is third quarter moon?</h3>
Third quarter moon is when the opposite half of the moon is illuminated compared to the first quarter moon. It is the last quarter moon of a lunar month.
<h3>Similarity between
first quarter moon and third quarter moon?</h3>
The similarity between first quarter moon and third quarter moon, is the moon is located perpendicular to Earth and the sun.
Thus, the similarity between first quarter moon and third quarter moon, is the moon is located perpendicular to Earth and the sun.
Learn more about first quarter moon here: brainly.com/question/13435421
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Answer:
63.6%
Explanation:
The given compound is:
N₂O;
The problem here is to find the percent composition of nitrogen in the compound.
First find the molar mass of the compound:
Molar mass of N₂O = 2(14) + 16 = 44g/mol
So;
Percentage composition of Nitrogen = x 100 = 63.6%