The closeness of a measurement to the actual value of what is being measured
Answers
This is known accuracy. Think of accuracy as like shooting at the bulls eye on a target.
However think of precision like if all your darts fell on the lower left side of the target. Precision is just how close together the measurements are with each other.
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PLEASE HELP ME WITH THESE THREE QUESTIONS!!!!!!!!!!!!Some of the newest types of modern appliances are 100% efficient and lose no energy to heat. True False A perpetual motion machine is an invention that has only worked a few times in history. True FalseThermal pollution occurs when factories use water to cool down their heated machinery, and then release the heated water into rivers and oceans. True False
The alkali metals are
An object has a mass of 20 g and volume of 10 cm. Enter the numerical value for the density of the object in units of g/cmº
Which type of fossil evidence helps determine the evolutionary relationship between two hominid species?
Answers
Ionization energy increases across a period from left to right in the periodic table.
Ionization energy
Ionization energy is the energy needed for the complete removal of valence electrons in its ground state from an isolated atom in its gaseous phase at a specified temperature to form an ion.
Ionization energy shows periodicity in that it shows a regular variation across a period and down a group in the periodic table.
Ionization energy increases across a period from left to right in the periodic table.
Learn more about ionization energy at: brainly.com/question/1445179
The trends showing increase in ionization energy on the periodic table ~
- Ionization energy increases as we move from left to right in a period.
[ due to increase in effective nuclear charge ]
- Ionization energy increases as we move from bottom to top in a group.
[ Due to decrease in number of shells ]
Answers
Answer:
Na number of 11
Explanation:
Pb no. 82
Au no. 79
Cu no. 29
Hg no. 80
Answer:
those have symbols for their Latin or Greek name
Explanation:
hope it helps
(2) hard-sphere model, electron-shell model, wave-mechanical model
(3) electron-shell model, wave-mechanical model, hard-sphere model
(4) electron-shell model, hard-sphere model, wave-mechanical model
Answers
Answer:2
Explanation:
HARD SPHERE MODEL
According to Dalton he viewed atoms as tiny, solid balls. His atomic theory had four statements which are:
1. Atoms are tiny, invisible particles.
2.Atoms of one element are all the same.
3.Atoms of different elements are different. 4.Compounds form by combining atoms.
ELECTRON SHELL MODEL
Bohr modified Rutherfords model of the atom by stating that electrons moves around the nucleus in orbit fixed sizes and energies.
WAVE MECHANICAL MODEL
Erwin states that electrons do not move in set path around the nucleus but in waves. He said it is impossible to know the exact point of an electron instead we have clouds of probability called the clouds.
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Molecules in a sample of NH3(l) are held closely together by intermolecular forces existing between ions. The answer is number 1. NH3 is governed by hydrogen bonding. Hydrogen bonding is the bonding between an H atom and the element that it combines with.
Answer:
D) Caused by unequal charge distribution
Explanation:
Answers
Answer:
Explanation:
The atomic number of zinc is 30, which means that the neutral atom has equal numbers of protons and electrons, so a neutral atom of zinc would have 30 electrons.
The electron configuration of a neutral zinc atom is 1s
2
2s
2
2p
6
3s
2
3p
6
3d
10
4s
2
.
The Zn
2+
ion has lost two electrons, which leaves it with 30 protons and 28 electrons.
The electron configuration of Zn
2+
is 1s
2
2s
2
2p
6
3s
2
3p
6
3d
10
.
2. Ba2SO4
3. BaSO4
4. Ba(SO4)2
Answers
Answer:
3. BaSO4
Explanation:
the math will show you, and to answer your commented question "How does this evidence indicate that the reaction has occurred between ions ?" :
The reaction of the ions can be checked by a number of methods. In a chemical reaction, the ions are in the aqueous solution. This means that they are in solution, dissolved with charge. During the reaction (ionic) there is an attraction between the positive and negative ions. This makes a change in the state of the reactants in the products. In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.