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a section of the periodic table is shown below:

periodic table showing three rows. row 1: boron (b), carbon (c), nitrogen (n), oxygen (p), fluorine (f), neon (ne). row 2: aluminum (al), silicon (si), phosphorus (p), sulfur (s), chlorine (cl), argon (ar). row 3: gallium (ga), germanium (ge), arsenic (as), selenium (se), bromine (br), krypton (kr).

which of the following elements has properties similar to n?

b
o
p
si

Phosphorus

Explanation:

The elements in same group shows similar properties.

Nitrogen family contain nitrogen, phosphorus, arsenic, antimony and bismuth.

Nitrogen and phosphorus are present in group 15 and show similar properties.

Both are nommetals.

Both make similar type of compounds.

Both have five valance electrons.

Both form common anion with charge of -3.

Both are used in fertilizers.

Both are used in explosive material.

With carbon, hydrogen, oxygen both nitrogen and phosphorus are found in living system.

(A) Detects operator contact with the machines point of operation

(C) Stops hazardous action if a workers body part comes too close

(D) Acts as a barrier between the worker and the machine.

Explanation:

(A) Detects operator contact with the machines point of operation: This is a necessary point for the Safeguarding device because when it will detect it can make sure that whatever the person is working on, is safe or not. Therefore the safeguarding device should be detecting operator's contact but not interrupting unnecessarily.

(C) Stops hazardous action if a workers body part comes too close: Safeguarding device must protect the worker body part from that comes too close to any harmful or hazardous machines, like a safeguarding device should prevent the operator from going too close to the crusher machine as it can lead to injuries.

(D) Acts as a barrier between the worker and the machine: The safeguarding device should be acting as a barrier between the operator and the machine as it will prevent any injuries to the operator. The device should not be preventing the worker to work but should act a protective shield between the machines and the operator.