Answer:
Halogens
Explanation:
From the given choices, the halogens will have the smallest radius within the same period.
The size of an atom is estimated by the atomic radius. This is taken as half of the inter-nuclear distance between two covalently bonded atoms of non-metallic elements or half of the distance between two nuclei in the solid state.
- Across a period in the periodic table, atomic radii decrease progressively from left to right.
- Down a group from top to bottom, atomic radii increase progressively due to the addition of successive shells.
Since halogen is the right most group from the choices given, it will have the smallest radius.
Answer:
In order of basicity we have
1. Soda pop (Least basic Normally called acidic)
2. Orange juice
3. Milk
4. Blood (slightly basic)
5. Hand soap
6. Drain cleaner (Highly basic)
Explanation:
Orange juice; the pH of orange juice is in the 3.3 to 4.2 range
Milk; the pH of milk about 6.5 to 6.7
Blood; the blood pH is around 7.35 to 7.45
Hand soap with contents such as ammonium hydroxide is basic, its pH is about 9-10
Drain cleaner contains baking soda or sodium bicarbonate which basic with a pH of 12 to 14
Soda pop pH of soda pop is in the range of 2.34 to 3.10. It contains carbonated water with a pH of 3–4, making it mildly acidic.
Arranging the above listed in order of increasing basicity, we have
1. Soda pop
2. Orange juice
3. Milk
4. Blood
5. Hand soap
6. Drain cleaner
A.) half - life of a radioactive substance is defined as the time during which concentration of the substance becomes half the initial value.
Answer:
Explanation:
1) Chemical formula of sodium carbonate: <em>Na₂CO₃</em>
2) Ratio of carbon atoms:
- The number of atoms of C in the unit formula Na₂CO₃ is the subscript for the atom, which is 1 (since it is not written).
Hence, the ratio is 1 C atom / 1 Na₂CO₃ unit formula.
This is, there is 1 atom of carbon per each unit formula of sodium carbonate.
3) Calculate the number of moles in 1.773 × 10⁷ carbon atoms
- Divide by Avogadro's number: 6.022 × 10²³ atoms / mol
- number C moles = 1.773 × 10⁷ atoms / (6.022 × 10²³ atoms/mol)
- number C moles = 2.941 × 10⁻¹⁷ mol
Since, the ratio is 1: 1, the number of moles of sodium carbonate is the same number of moles of carbon atoms.
Answer:well the ice preserves the wooly mammoths
Explanation:its not just snow its bacteria witch means that once living to frozen thats how they know how it looks like and to see what animal its related to now day it related to the elephants
