how to jump in a 2D game

i wrote this code. i learnt it with 3D, and i tried with 2D (changing the components to 2D)
the right and left moving work, but the jump is not working. how can i fix it?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class ControlliTastiera : MonoBehaviour
{

    public float velocitah;     
    public float forzaSalto;        // = jumpForce

    // Use this for initialization
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

        Rigidbody2D Corpoh = this.GetComponent<Rigidbody2D>();


        if (Input.GetKey(KeyCode.RightArrow))
        {
            Vector3 nuovaPos = this.transform.position;
            nuovaPos.x += Time.deltaTime * velocitah;
            this.transform.position = nuovaPos;
        }
        if (Input.GetKey(KeyCode.LeftArrow))
        {
            Vector3 nuovaPos = this.transform.position;
            nuovaPos.x -= Time.deltaTime * velocitah;
            this.transform.position = nuovaPos;         // nuovaPos = newPos
        }

        if (Input.GetKey(KeyCode.UpArrow))
        {
            Vector3 salto = new Vector3();
            salto.y = forzaSalto;           // salto = jump (in italian)
            Corpoh.AddForce(salto);         
        }


    }
}

Change:

if (Input.GetKey(KeyCode.UpArrow))
             {
                 Vector3 salto = new Vector3();
                 salto.y = forzaSalto;           // salto = jump (in italian)
                 Corpoh.AddForce(salto);         
             }

to:

if ( Input.GetKey(KeyCode.UpArrow) )
        {
            Vector2 salto = new Vector2();
            salto.y = forzaSalto;           // salto = jump (in italian)
            Corpoh.AddForce(salto,ForceMode2D.Impulse);
        }

@PPenar thank, it worked. now i’ve a new problem…
i want to add the isGrounded Property, i tried this code but it’s not working well:

void Update(){

......

    if ((Input.GetKeyDown(KeyCode.UpArrow))&(aTerra))
        {
            Vector2 salto = new Vector2();
            salto.y = forzaSalto;           // salto = jump (in italian)
            Corpoh.AddForce(salto, ForceMode2D.Impulse);
        }

    }

private void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.tag== "TagTerra")
        {
            aTerra = true;
        }
    }

private void OnCollisionExit(Collision collision)
    {
        if (collision.gameObject.tag== "TagTerra")
        {
            aTerra = false;
        }
    }

how can i fix the jump section?