[quote][b]Assault, first degree, penalty.[/b]
565.050. 1. A person commits the crime of assault in the first degree if he attempts to kill or knowingly causes or attempts to cause serious physical injury to another person.

2. Assault in the first degree is a class B felony unless in the course thereof the actor inflicts serious physical injury on the victim in which case it is a class A felony.

[b]Assault, second degree, penalty.[/b]
565.060. 1. A person commits the crime of assault in the second degree if he:

(1) Attempts to kill or knowingly causes or attempts to cause serious physical injury to another person under the influence of sudden passion arising out of adequate cause; or

(2) Attempts to cause or knowingly causes physical injury to another person by means of a deadly weapon or dangerous instrument; or

(3) Recklessly causes serious physical injury to another person; or

(4) While in an intoxicated condition or under the influence of controlled substances or drugs, operates a motor vehicle in this state and, when so operating, acts with criminal negligence to cause physical injury to any other person than himself; or

(5) Recklessly causes physical injury to another person by means of discharge of a firearm; or

(6) Operates a motor vehicle in violation of subsection 2 of section 304.022, and when so operating, acts with criminal negligence to cause physical injury to any person authorized to operate an emergency vehicle, as defined in section 304.022, while such person is in the performance of official duties.

2. The defendant shall have the burden of injecting the issue of influence of sudden passion arising from adequate cause under subdivision (1) of subsection 1 of this section.

3. Assault in the second degree is a class C felony.

[b]Assault in the third degree.[/b]
565.070. 1. A person commits the crime of assault in the third degree if:

(1) The person attempts to cause or recklessly causes physical injury to another person; or

(2) With criminal negligence the person causes physical injury to another person by means of a deadly weapon; or

(3) The person purposely places another person in apprehension of immediate physical injury; or

(4) The person recklessly engages in conduct which creates a grave risk of death or serious physical injury to another person; or

(5) The person knowingly causes physical contact with another person knowing the other person will regard the contact as offensive or provocative; or

(6) The person knowingly causes physical contact with an incapacitated person, as defined in section 475.010, which a reasonable person, who is not incapacitated, would consider offensive or provocative.

2. Except as provided in subsections 3 and 4 of this section, assault in the third degree is a class A misdemeanor.

3. A person who violates the provisions of subdivision (3) or (5) of subsection 1 of this section is guilty of a class C misdemeanor.

4. A person who has pled guilty to or been found guilty of the crime of assault in the third degree more than two times against any family or household member as defined in section 455.010 is guilty of a class D felony for the third or any subsequent commission of the crime of assault in the third degree when a class A misdemeanor. The offenses described in this subsection may be against the same family or household member or against different family or household members.[/quote]

There you go. Missouri code.