Charge on particle
sub atomic particle charge
a negative
b neutral

based on the quantum model, which of the following correctly compares the location of the subatomic particles?
particle a is packed in the nucleus and particle b is present in shells.
particle a spirals into the nucleus and particle b is packed in the nucleus.
particle a is embedded in a solid sphere and particle b is present in the 3d orbitals.
particle a is present in the electron cloud and particle b is packed in the dense center.

Particles A is present in the electron cloud and Particle B is packed in the dense center.

Explanation:

Atoms are the building blocks of any element. So it is known that atoms comprise of positive, negative and neutral fundamental subatomic particles. Different models are proposed for the structure of atom at the starting stage of atomic structure. But at the end, the quantum model succeeded in giving a clear view of the structure of atom.

If we consider, that one of the subatomic particles considered as Particle A is negatively charged and another subatomic particle considered as Particle B is neutral, then we can arrange its location using quantum model.

As per quantum model, the electrons are negatively charged and protons are positively charged while the neutrons are neutrally charged. So the particle A which is negatively charged can be compared to electrons. As electrons are present in electron cloud, so we can state that particle A is present in the electron cloud. Also the neutrally charged particle B can be compared to neutron. And thus , the location of particle B can be stated to be packed in the dense center of nucleus.

So Particle A is present in the electron cloud and Particle B is packed in the dense center as per quantum model.

pre-sliced bread is a relatively recent development in baking technology. previous to that, it was always sold in a bakery in daily-made contiguous loaves with no wrapping, and was moderately perishable, usually being used with a day or two (which is why every bakery had a discounted “day-old” bread table.) therefore, pre-sliced bread would grow stale quickly. the hard crust provided a protective layer, and once the exposed dry slice left from the previous cut was removed, the interior was still soft.

what keeps bread soft is the moisture retained in the crumb (the light spongy part that’s not crust). the reason the crust develops is the surface of the dough gets exposed to hot dry air during baking which browns the outer layer and seals it, preventing all the moisture from escaping the dough. longer exposure to air will also eventually cause your bread to lose flavor and become stale.

people were used to cutting slices as they needed them and storing bread in a specially-made wooden or metal breadbox or pail with a lid to preserve it longer, but the first automatically sliced commercial loaves were produced on july 6, 1928, in chillicothe, missouri, using a machine invented by otto rohwedder, an iowa-born, missouri-based jeweler.[1] pre-sliced bread would indeed dry out, were it not for another 20th century technology: the plastic bag. bread could now be pre-sliced, and if the enclosing bag remains sealed as much as possible, the bread will remain soft and fresh for longer than if sitting unwrapped on a shelf or enclosed in a bread box that is not air-tight. sealed packaging meant bread could also be sold on store shelves and eliminate frequent trips to a bakery.

sealing bread in a plastic bag had another effect: the moisture in the loaf will re-distribute into the crust and soften it, which is sometimes more pleasing in a sandwich - especially for children whose teeth might not yet be strong enough to tear through a hard crust. a homemade loaf of bread can be sealed in a bag overnight and the crust will become soft like store-bought sandwich bread.

these were novel changes in how bread was produced and sold, which led to the coining of the phrase “the greatest thing since sliced bread.”